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Lars Occhionero has been at 1 events

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Andrij “Andrew” Harasewych343,208*March 14, 2015 9:26:53 will be epic.* Why? 3.141592653 = π Take advantage of this day to spread some love of math and science. Teach something, share something, learn something, or read something!Pi Day!2015-03-14 14:26:00584  

Shared Circles including Lars Occhionero

Shared Circles are not available on Google+ anymore, but you can find them still here.

Top posts in the last 50 posts

Most comments: 8

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2014-01-11 17:06:56 (8 comments, 1 reshares, 17 +1s)Open 

+Hank Green explaining that Climate Changes is not something you can experience just by weather-changes (e.g. just because it's cold as hell in the US doesn't mean Global Warming is a hoax (!) ) 

Most reshares: 6

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2014-03-25 13:35:27 (1 comments, 6 reshares, 14 +1s)Open 

Most plusones: 25

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2014-08-01 15:32:13 (1 comments, 4 reshares, 25 +1s)Open 


(Pac-Man) Auxiliary Telescope 2 - Atacama Desert (Chile)

http://space.io9.com/are-you-gonna-to-eat-that-1539663264

Latest 50 posts

2015-03-27 13:22:39 (0 comments, 0 reshares, 0 +1s)Open 

Attention all international friends!
My friend +Christian Elleby Andersen is looking for an industrial placement this autumn 2015 somewhere abroad!

The topic he would like to work with is how to manage Research and development or innovation activities, and the learning and knowledge gained through these activities
The industry placement would be centered around a project in this topic, but can also include other internships duties alongside with it.

Go network ;) 

Attention all international friends!
My friend +Christian Elleby Andersen is looking for an industrial placement this autumn 2015 somewhere abroad!

The topic he would like to work with is how to manage Research and development or innovation activities, and the learning and knowledge gained through these activities
The industry placement would be centered around a project in this topic, but can also include other internships duties alongside with it.

Go network ;) ___

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2015-03-10 13:17:45 (0 comments, 0 reshares, 0 +1s)Open 

Understanding pain

Understanding pain___

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2014-11-24 17:41:06 (0 comments, 0 reshares, 1 +1s)Open 

___

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2014-09-03 12:30:22 (0 comments, 2 reshares, 3 +1s)Open 

"Nightfall"
To learn more about astrophotography join my 500px group -  http://500px.com/groups/real-astrophotography 

Prints - www.HomeGroenPhotograhy.com

www.500px.com/AaronGroen

+Aaron J. Groen +HomeGroen Photography 
#milkyway   #real   #astrophotography   #waterfall   #cosmos   #stars   #galaxy  

 http://500px.com/photo/81927257/nightfall-by-aaron-j-groen

"Nightfall"
To learn more about astrophotography join my 500px group -  http://500px.com/groups/real-astrophotography 

Prints - www.HomeGroenPhotograhy.com

www.500px.com/AaronGroen

+Aaron J. Groen +HomeGroen Photography 
#milkyway   #real   #astrophotography   #waterfall   #cosmos   #stars   #galaxy  

 http://500px.com/photo/81927257/nightfall-by-aaron-j-groen___

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2014-08-01 15:32:13 (1 comments, 4 reshares, 25 +1s)Open 

nom nom nom nom


(Pac-Man) Auxiliary Telescope 2 - Atacama Desert (Chile)

http://space.io9.com/are-you-gonna-to-eat-that-1539663264___nom nom nom nom

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2014-06-15 10:15:01 (0 comments, 1 reshares, 4 +1s)Open 

!!!!

!!!!___

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2014-05-29 13:10:57 (0 comments, 0 reshares, 5 +1s)Open 

Rumor Weed

Yesterday there was a flurry of news about a gamma ray burst (GRB) appearing in the Andromeda galaxy.  This would make it the closest observed gamma ray burst, which would be a boon for astronomers.  News of this discovery travelled fast, particularly on Twitter and other social networks.  Pretty soon a few news sites had picked up the story. But it turns out it wasn’t a gamma ray burst.  

It all started with a space telescope known as Swift.  Swift is designed to study gamma ray bursts, and one of its detectors is a wide field telescope known as the Burst Array Telescope (BAT).  The BAT is designed to look for bursts of high energy radiation from unknown sources.  If it detects one, it “triggers” and sends an alert so that other telescopes can be position to observe the event.  Gamma ray bursts can be short lived, so time is of the essence.
Normally th... more »

Rumor Weed

Yesterday there was a flurry of news about a gamma ray burst (GRB) appearing in the Andromeda galaxy.  This would make it the closest observed gamma ray burst, which would be a boon for astronomers.  News of this discovery travelled fast, particularly on Twitter and other social networks.  Pretty soon a few news sites had picked up the story. But it turns out it wasn’t a gamma ray burst.  

It all started with a space telescope known as Swift.  Swift is designed to study gamma ray bursts, and one of its detectors is a wide field telescope known as the Burst Array Telescope (BAT).  The BAT is designed to look for bursts of high energy radiation from unknown sources.  If it detects one, it “triggers” and sends an alert so that other telescopes can be position to observe the event.  Gamma ray bursts can be short lived, so time is of the essence.

Normally the level needed for the BAT to trigger is pretty high (6.5 sigma for you statisticians) so that it doesn’t cry wolf all the time (what are known as spurious events).  But the bar is set a bit lower if the energy burst seems to be from a nearby galaxy.  So Tuesday night (EDT) BAT detected a burst, and Swift’s x-ray telescope also observed a burst of x-rays.  The burst also happened to be in the direction of the Andromeda galaxy.  So it triggered and the alert went out.

Naturally, some of the astronomers working in this area of research use Twitter, and started tweeting about a possible GRB in Andromeda.  This was picked up by their fans and other astronomers, and the whole thing cascaded.  It turns out it was a known x-ray source, probably an x-ray binary.  So while it initially looked promising, it turned out to be a spurious event.  Sometimes this happens, and it is better to have the occasional false alarm rather than miss an important event.

Of course all of this played out in the social media circles, and its seems rather chaotic at the time. It also means sometimes things get reported as far more certain than they actually are.  If you actually look at what is being said, however, you’ll see something rather interesting.  If you go back and look at the comments, such as those tagged with #GRBM31 on Twitter, you’ll notice that the astronomers are pretty careful about saying things like “possible” GRB.  They spread the tentative news, and start looking for evidence to confirm or deny the event.  As they learn things from a clear source, they start tweeting that as well.  You’ll also note there is a great deal of excitement.

This is part of what makes science interesting.  Cool things happen, even if we later find out it isn’t as cool as we thought.___

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2014-05-26 13:39:09 (0 comments, 0 reshares, 4 +1s)Open 

Battle of the Bands

When light passes through gas and dust in the interstellar medium, some of the light is absorbed. Since the gas and dust only absorb certain wavelengths or colors of light, by by looking at these absorption bands we can determine the type of material that makes up the interstellar media.  Well, most of the time. It turns out there are a range of absorption bands that we haven’t been able to identify. They are known as diffuse interstellar bands.

One of the difficulties with these diffuse interstellar bands is that they don’t seem to match any known atoms or molecules. We know there are molecules that could form within the interstellar medium, but many of them haven’t been analyzed in the labs. Analyzing the line spectra of different compounds in a range of conditions such as vacuum and low temperatures is time consuming. Since it isn’t veryglamorou... more »

Battle of the Bands

When light passes through gas and dust in the interstellar medium, some of the light is absorbed. Since the gas and dust only absorb certain wavelengths or colors of light, by by looking at these absorption bands we can determine the type of material that makes up the interstellar media.  Well, most of the time. It turns out there are a range of absorption bands that we haven’t been able to identify. They are known as diffuse interstellar bands.

One of the difficulties with these diffuse interstellar bands is that they don’t seem to match any known atoms or molecules. We know there are molecules that could form within the interstellar medium, but many of them haven’t been analyzed in the labs. Analyzing the line spectra of different compounds in a range of conditions such as vacuum and low temperatures is time consuming. Since it isn’t very glamorous, it doesn’t tend to get much funding, and that limits our ability to analyze the bands.

Another challenge is that different bands can be stronger or weaker relative to each other. This means they are likely due to a range of processes.  There is some evidence that the strength of the bands correlates with the amount of dust in the region, so they are likely related to some kind of dust feature.  Right now one of the favored ideas is that they are due to some kind of larger hydrocarbon molecule. But as for the details, we just don’t know.

Image: NASA/P. Jenniskens and F.-X. Desert___

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2014-05-13 09:48:43 (0 comments, 0 reshares, 1 +1s)Open 

The pyro board is back!

Now with a selection of music.

The pyro board is back!

Now with a selection of music.___

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2014-05-13 09:48:17 (1 comments, 0 reshares, 3 +1s)Open 

#Finland #Norway #Sweden and #Denmark - get ready for the Rosetta truck, a touring exhibition about our comet-chaser #Rosetta -  visiting a city near you in May!

http://blogs.esa.int/rosetta/2014/04/22/rosetta-hits-the-road-in-scandinavia-and-finland/

#rosettatour  

#Finland #Norway #Sweden and #Denmark - get ready for the Rosetta truck, a touring exhibition about our comet-chaser #Rosetta -  visiting a city near you in May!

http://blogs.esa.int/rosetta/2014/04/22/rosetta-hits-the-road-in-scandinavia-and-finland/

#rosettatour  ___

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2014-05-11 16:07:11 (1 comments, 0 reshares, 1 +1s)Open 

A great comparrison of Mars rovers

A great comparrison of Mars rovers___

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2014-05-01 11:45:57 (0 comments, 0 reshares, 0 +1s)Open 

Ping +Kathrine Dahl  :oD 

New Release for Hunter: The Vigil!

Includes rules for Prometheans, changelings, sin-eaters, mummies, and demons as Hunter antagonists, and updates to bring Hunter in line with GMC rules.___Ping +Kathrine Dahl  :oD 

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2014-04-18 11:41:50 (0 comments, 0 reshares, 4 +1s)Open 

In case you missed it. +NASA has announced it has found the earth-size planet in a star's habitable zone, meaning the first true "Earth Twin" using data from Kepler. This is very exciting! Next step would be to see if it's possible to get a signal from the atmosphere's spectrum. That would reveal what the atmosphere is made of, and could possibly tell us if there is life (or possibility of life) in the planet. Great news! 
#Kepler #KASC 

In case you missed it. +NASA has announced it has found the earth-size planet in a star's habitable zone, meaning the first true "Earth Twin" using data from Kepler. This is very exciting! Next step would be to see if it's possible to get a signal from the atmosphere's spectrum. That would reveal what the atmosphere is made of, and could possibly tell us if there is life (or possibility of life) in the planet. Great news! 
#Kepler #KASC ___

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2014-04-18 08:04:58 (1 comments, 0 reshares, 3 +1s)Open 

Fysikshow Århus, now on +Veritasium thanks to +Derek Muller and +Klaus Seiersen  :D 

___Fysikshow Århus, now on +Veritasium thanks to +Derek Muller and +Klaus Seiersen  :D 

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2014-04-17 12:09:16 (1 comments, 4 reshares, 13 +1s)Open 

A great gif. Conservation of Energy made real

THIS GUY . . . right?!

Probably the best GIF ever made. #boop  ___A great gif. Conservation of Energy made real

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2014-04-14 10:05:13 (3 comments, 0 reshares, 17 +1s)Open 

A must see video by +Henry Reich. Not about Physics, but about a very insane situation in Venezuela. I really do not understand why we, starstuff given the ability to try and understand itself, capable of marvelous things, continue fighting each other... Mostly for the transference of small pieces of paper, that clearly doesn't make us happier.... 

A must see video by +Henry Reich. Not about Physics, but about a very insane situation in Venezuela. I really do not understand why we, starstuff given the ability to try and understand itself, capable of marvelous things, continue fighting each other... Mostly for the transference of small pieces of paper, that clearly doesn't make us happier.... ___

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2014-04-14 09:56:44 (0 comments, 1 reshares, 4 +1s)Open 

A primer in the history of Gravity (the theory) 

A primer in the history of Gravity (the theory) ___

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2014-04-07 15:50:01 (2 comments, 0 reshares, 2 +1s)Open 

Consume Mass Quantities

One of the big questions many people have about black holes is what happens when something enters one.  A recent Cosmos episode not withstanding, there is no reason to suspect that entering a black hole would take you to an alternate universe.  If you were to fall into a black hole, you would simply be in the black hole.  What happens to you after that depends upon the nature of quantum gravity, which we still don’t fully understand.

Of course all of this is according to general relativity.  While general relativity has been confirmed by multiple experiments, what evidence do we have of things falling into a black hole?  It turns out we have lots of broad evidence, and a bit of specific evidence.  The broad evidence comes from the observation of active galactic nuclei (AGN), which includes things like quasars, blazars and radio galaxies.  Thesehighly e... more »

Consume Mass Quantities

One of the big questions many people have about black holes is what happens when something enters one.  A recent Cosmos episode not withstanding, there is no reason to suspect that entering a black hole would take you to an alternate universe.  If you were to fall into a black hole, you would simply be in the black hole.  What happens to you after that depends upon the nature of quantum gravity, which we still don’t fully understand.

Of course all of this is according to general relativity.  While general relativity has been confirmed by multiple experiments, what evidence do we have of things falling into a black hole?  It turns out we have lots of broad evidence, and a bit of specific evidence.  The broad evidence comes from the observation of active galactic nuclei (AGN), which includes things like quasars, blazars and radio galaxies.  These highly energetic objects are powered by active black holes.  Comparison of these objects to black hole models show strong agreement.  We know, for example, that black holes can develop an accretion disk of matter being consumed, as well as large jets of particles streaming from their poles.

We also have some evidence of black holes consuming individual stars. In 2011, the Pan-STARRS  telescope observed what initially appeared to be a supernova at the center of a galaxy about 2.7 billion light years away.  The spectrum of this burst indicated a large presence of helium, but no evidence of hydrogen.  This means it was not likely just some gas captured by the black hole (which would be a mix of helium and hydrogen), but rather due to the core of an old star (which is mostly helium) being captured.

Closer to home, we can observe a cloud of gas near the supermassive black hole in our own galaxy as it is gradually being torn apart.  In this case the cloud isn’t directly being consumed by the black hole, but the way in which the cloud is being torn apart has matched computer simulations of such close encounters.

So we actually have a good understanding of what happens to things as they fall into a black hole.  There are still questions yet to be answered, but our black hole models are rooted in observational evidence.

Image: Simulation of a star near a black hole. NASA/JPL-Caltech/JHU/UCSC___

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2014-04-07 15:09:47 (0 comments, 0 reshares, 1 +1s)Open 

Well, yes, agreed

Well, yes, agreed___

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2014-04-01 11:19:35 (0 comments, 0 reshares, 0 +1s)Open 

Blizzard being April 1. hilarious :D 

Blizzard being April 1. hilarious :D ___

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2014-03-30 17:58:51 (1 comments, 0 reshares, 2 +1s)Open 

An asteroid with rings, detected using lightcurves, the same way we find planets. Might this be a way to find rings around exoplanets as well? :D

Put a Ring On It

Astronomers have found an asteroid with a ring system, and the results have been published Nature (pdf: http://goo.gl/kvPF2u). While this is the first discovery of a ring system about an asteroid, such a thing isn’t entirely unexpected.  We have known for a while that asteroids can have moons, for example.  But what’s particularly interesting is how they discovered these rings.

The asteroid in question is known as  Chariklo, a 130 kilometer wide object that orbits between the orbits of Saturn and Uranus.  It is the largest example of the Centaur group, which are likely Kuiper belt objects that were captured by the gravitational pull of the outer planets.  In the Summer of 2013, Chariklo passed in front of a dim, 12th-magnitude star as seen from parts of South America.  It is a phenomenon known as an occultation.

Such an event is a great opportunity to better determine the size and shape of an asteroid, so a team of astronomers dispersed through Brazil, Argentina, Uruguay and Chile made observations of the occultation.  Since each observation is made from a different vantage point, Chariklo’s occultation of the background star occurs at a slightly different orientation.  By combining these different observations the team could map the overall shape of the asteroid.

But what the team found was that from some vantage points the background star dimmed a couple times before being occulted by Chariklo, then dimmed a couple times after the occultation as well. Analysis of these pre and post dips makes it pretty clear that there are at least two rings around the asteroid.

Knowing that Chariklo has a ring system, the team was also able to determine a bit about the composition of the rings.  As Chariklo (or any other ringed object) orbits the Sun, there are times when the rings are seen more edge on, and times when we see more of the rings.  The team compared spectral observations of the asteroid between 1997 and 2008, and found that the asteroid gradually dimmed during that period.  The observation of water ice in the spectrum also faded during that period.  This would be consistent with a ring system containing ice (which is very reflective) gradually shifting to an edge-on orientation.

One of the more surprising aspects of the discovery is that the rings are so sharp and dense.  Typically a ring system would diffuse over time unless there are shepherd moons to keep the rings in order.  So it may be that Chariklo has not only a ring system, but a moon system as well.

To determine whether that is the case, it will likely take some high resolution imaging.  But that remains to be seen.

Image: Lucie Maquet

Paper:  F. Braga-Ribas, B. Sicardy, et al. A ring system detected around the Centaur (10199) Chariklo. Nature (2014) doi:10.1038/nature13155.___An asteroid with rings, detected using lightcurves, the same way we find planets. Might this be a way to find rings around exoplanets as well? :D

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2014-03-25 13:35:27 (1 comments, 6 reshares, 14 +1s)Open 

That is hilarious! 

___That is hilarious! 

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2014-03-14 10:41:20 (0 comments, 0 reshares, 2 +1s)Open 

You get some, you lose some :D 

You get some, you lose some :D ___

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2014-03-13 10:27:50 (0 comments, 3 reshares, 7 +1s)Open 

This is the greates app in the history of apps. Well, perhaps on-par with the scale of the universe one

How much mass energy is there in a raisin? Or a mosquito? Or the earth? Find out in the newest lab from MinuteLabs___This is the greates app in the history of apps. Well, perhaps on-par with the scale of the universe one

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2014-03-10 12:04:52 (0 comments, 0 reshares, 2 +1s)Open 

A great post on how science and "very little evidence" can cause media hype. Sob, we need better science-journalists...

On Dark Matter and Dinosaurs

Let me begin by saying there is no evidence that dark matter killed the dinosaurs.  None whatsoever.  Unfortunately the idea was posted on Nature’s blog, and from there it went to Scientific American and elsewhere.  The various social media took the story and it has spread like a prairie wildfire.  The actual preprint is much less sensational (and doesn’t mention dinosaurs) but it is still very speculative.  

The idea comes from the fact that the Sun does not follow a flat orbit around the galaxy.  Instead, its motion wobbles above and below the galactic plane, crossing the galactic plane every 35 million years.  This isn’t unusual, as lots of stars follow similar paths, but it has led some to speculate that perhaps this periodicity could explain periodic mass extinctions in the geologic record.

The problem is, there isn’t any strong evidence for cyclic mass extinctions.  Some analysis of the data has hinted at a pattern, but the correlation isn’t very strong.  Of course that hasn’t stopped people from proposing everything from companion stars to Nibiru to explain these periodic extinctions.  There been similar proposals that every time the Sun crosses the galactic plane the Oort cloud would be disrupted, causing comets to sweep into the inner solar system and bombard the Earth.

What’s new here is that the authors propose that dark matter within the plane of the galaxy is doing the disrupting.  As I wrote about last week, there is a hint of dark matter seen in gamma ray observations of the center of our galaxy.  One model that could account for these gamma rays is type of dark matter that would lie within the galactic plane.  So if this type of dark matter exists, and if it disrupts the Oort cloud when the Sun crosses the galactic plane, and if that caused comets to fling into the inner solar system and bombard the Earth, and if that bombardment caused periodic mass extinctions, then you should see some evidence in the geologic record.

So what evidence is there?  None.  Well, not quite none.  If you assume the model is true, and then look for a periodicity in the cratering record of Earth, you find that the cratering record agrees with the model about three times better that it agrees with random cratering.  Scientifically, that isn’t very convincing data.  It makes for a mildly interesting paper, but it’s mostly speculation at this point.

But Nature and several other websites have decided to take this speculative idea, add the word dinosaurs to the title, and imply that scientists are proposing dark matter killed the dinosaurs.  No one is proposing that.  It’s link-bait noise that makes the job of communicating real science all that more difficult.  So if you see one of these sensationalized titles, don’t share it on social media.  Tell your friends that share the articles that it’s speculative nonsense.  Hopefully we can drown this noise and get back to real science.

Because honestly, science is interesting enough without the hype.

Image: Concept art from Dinosaurs vs Aliens (http://goo.gl/YrU88)

Paper:  Lisa Randall, Matthew Reece. Dark Matter as a Trigger for Periodic Comet Impacts. arXiv:1403.0576 [astro-ph.GA] (2014).___A great post on how science and "very little evidence" can cause media hype. Sob, we need better science-journalists...

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2014-03-08 09:18:58 (0 comments, 0 reshares, 1 +1s)Open 

Google says it better then I could. Happy international women's day.  #Internationalkvindedag   #GoogleDoodles   

Google says it better then I could. Happy international women's day.  #Internationalkvindedag   #GoogleDoodles   ___

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2014-03-04 17:16:00 (2 comments, 1 reshares, 4 +1s)Open 

A bit on something my project is about... 

Song of the Sun

There’s a song of the Sun.  It is produced by acoustic waves in the Sun’s interior, and the study of these waves is known as helioseismology.  

It turns out to be a very useful tool.  While light travels slowly through the Sun’s interior, taking thousands of years to travel from the Sun’s core to its surface, the solar interior is relatively transparent to acoustic waves, which means they can travel through the Sun at the speed of sound.

Because of this, sound waves in the Sun can be used to study the Sun’s interior, similar to the way ultrasound is used to see inside the human body.  The difference is that we can’t send sound waves through the Sun, but instead have to measure the natural sound waves that occur within the Sun.  We do this by measuring the oscillations of the Sun’s surface using the Doppler shift of spectral lines.

By analyzing these oscillations, we know that the interior of the Sun (known as the radiation zone because heat transfers radiantly in the core) rotates uniformly, while the outer layers (the convection zone) rotate differentially by latitude.  Acoustic analysis also gives us a measure of how the density and pressure of the Sun varies by depth, since the speed of sound within the Sun is affected by density and pressure.

There are even audio recordings of the Sun, where the solar oscillations have been speed up a bit and converted to sounds we can hear.  You can hear several of them here: http://goo.gl/bWWv

Image:  NOAO___A bit on something my project is about... 

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2014-02-28 18:01:03 (2 comments, 5 reshares, 9 +1s)Open 

This is absolutely mind-blowing! 

This is absolutely mind-blowing! ___

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2014-02-23 16:01:29 (0 comments, 0 reshares, 3 +1s)Open 

On Spectroscopy, the most important tool in modern science.

Rainbow Star

Spectroscopy is one of the most useful tools of modern astronomy.  With it we can identify the atomic and molecular composition of celestial objects, we can measure the relative motions of stars, and we can observe the expansion of the cosmos.  While early spectroscopes used prisms to break light into a spectrum, modern telescopic spectroscopes generally use a device known as a diffraction grating.

A prism is able to separate light into colors due to the fact that different colors bend at different angles when passing through a material.  You might remember this effect as the cause of chromatic aberration in telescopic lenses.  A diffraction grating uses the the wavelength of the light itself to create a spectrum.

Since light has properties of a wave, it spreads out in all directions from a source, just as ripples caused by dropping a stone in a pond.  Just as water waves can interfere and overlap, so can light waves.  The resulting effect that we see is due to the sum of all the light waves.  A diffraction grating is a fine grating of reflective surfaces, kind of like a reflective picket fence (but tiny).  When light strikes the diffraction grating, it is reflected from each different grating.  The light from each of those reflections spreads out in all directions, and they all interfere and overlap each other.  Because of the spacing of these gratings, different wavelengths of light are favored at different angles.  At each different angle of reflection we see a different wavelength.

There is a specific mathematical relation between the angle of reflection and the wavelength, so with a good diffraction grating we can get a very precise measure of the wavelength.  This makes it possible to make precision measurements of starlight and compare them to measurements done in the lab.  From this we can determine the properties of stars and galaxies.

Image:  Spectrum of sunlight created by a diffraction grating.  Taken by me.___On Spectroscopy, the most important tool in modern science.

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2014-02-13 22:19:57 (0 comments, 0 reshares, 3 +1s)Open 

This is absolutely hilarious! 

This is absolutely hilarious! ___

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2014-02-12 19:04:23 (0 comments, 0 reshares, 2 +1s)Open 

This is quite interesting. I am somewhat skeptical, but it could be quite promising... What does the Science Society of Google+ say?

This is quite interesting. I am somewhat skeptical, but it could be quite promising... What does the Science Society of Google+ say?___

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2014-02-12 17:44:44 (0 comments, 0 reshares, 14 +1s)Open 

I love that "Heresy" comes from "Choice" Quite fitting :P

I love that "Heresy" comes from "Choice" Quite fitting :P___

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2014-02-10 10:34:12 (0 comments, 1 reshares, 3 +1s)Open 

This is a great Tumblr, giving a great perspective on what space exploration really costs, compared to other governmental and industrial expenses. I hope someday people realize that space exploration, and it's possibility to truly increase awesome in the world is well worth the cost! Ping +Hank Green 

This is a great Tumblr, giving a great perspective on what space exploration really costs, compared to other governmental and industrial expenses. I hope someday people realize that space exploration, and it's possibility to truly increase awesome in the world is well worth the cost! Ping +Hank Green ___

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2014-01-25 21:28:28 (4 comments, 0 reshares, 8 +1s)Open 

Ah, the internet is a great source for amusement. The customer reviews on this tin og Uranium Ore are simply fantastic. I especially love: "I purchased this product 4.47 Billion Years ago and when I opened it today, it was half empty."

Ah, the internet is a great source for amusement. The customer reviews on this tin og Uranium Ore are simply fantastic. I especially love: "I purchased this product 4.47 Billion Years ago and when I opened it today, it was half empty."___

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2014-01-25 12:42:34 (0 comments, 0 reshares, 1 +1s)Open 

Philosophy og Science 101 - Part 1 thanks to +Henry Reich 

Philosophy og Science 101 - Part 1 thanks to +Henry Reich ___

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2014-01-24 15:58:48 (2 comments, 0 reshares, 1 +1s)Open 

A star has gone BOOM 12 mio light-years from here (so technically it went BOOM 12 mio years ago). It's quite a bright Supernova!

A star has gone BOOM 12 mio light-years from here (so technically it went BOOM 12 mio years ago). It's quite a bright Supernova!___

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2014-01-20 09:55:39 (0 comments, 0 reshares, 1 +1s)Open 

International #TableTopDay  is going to be on the 5th of April. This year I want to join in!  

International #TableTopDay 2014 is on APRIL 5TH! Share this with your friends and let us know what you're playing in the comments!___International #TableTopDay  is going to be on the 5th of April. This year I want to join in!  

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2014-01-19 18:58:08 (0 comments, 0 reshares, 1 +1s)Open 

+John Green (Or somebody else at the awesome +Mental Floss or the all-knowing interwebz) Can you find a source on the Ptolomy / Shooting star story (#10). Our boss at the planetarium has made it a competition to find sources about shooting stars and comets in antiquity, since he has almost given up... So that would be nice :D 

+John Green (Or somebody else at the awesome +Mental Floss or the all-knowing interwebz) Can you find a source on the Ptolomy / Shooting star story (#10). Our boss at the planetarium has made it a competition to find sources about shooting stars and comets in antiquity, since he has almost given up... So that would be nice :D ___

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2014-01-17 12:59:29 (2 comments, 5 reshares, 5 +1s)Open 

Thanks +Derek Muller for an insight on Facebook. 

Thanks +Derek Muller for an insight on Facebook. ___

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2014-01-14 19:17:39 (0 comments, 0 reshares, 1 +1s)Open 

I am not a great fan of motivational videos. Most seem quite cheesy and superficial. +Beckie0 however has made a quite good collection of motivational quotes, that actually might get you out of bed, and do stuff. I hope it works with my thesis :P 

If you found this helpful, please share and spread this around!
Thank you :). x___I am not a great fan of motivational videos. Most seem quite cheesy and superficial. +Beckie0 however has made a quite good collection of motivational quotes, that actually might get you out of bed, and do stuff. I hope it works with my thesis :P 

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2014-01-11 17:06:56 (8 comments, 1 reshares, 17 +1s)Open 

+Hank Green explaining that Climate Changes is not something you can experience just by weather-changes (e.g. just because it's cold as hell in the US doesn't mean Global Warming is a hoax (!) ) 

+Hank Green explaining that Climate Changes is not something you can experience just by weather-changes (e.g. just because it's cold as hell in the US doesn't mean Global Warming is a hoax (!) ) ___

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2014-01-06 21:36:48 (2 comments, 0 reshares, 1 +1s)Open 

Megatelescopes... I really like the sound of that

Megatelescopes... I really like the sound of that___

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2014-01-06 21:35:36 (0 comments, 0 reshares, 2 +1s)Open 

Find your sunfilters, and go out and watch a naked eye sunspot!!!!

Find your sunfilters, and go out and watch a naked eye sunspot!!!!___

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2013-12-30 17:03:28 (1 comments, 0 reshares, 1 +1s)Open 

Well, this is nice to see. So console-prices are not so different after all... Still too expensive for me right now, sadly :( 

Well, this is nice to see. So console-prices are not so different after all... Still too expensive for me right now, sadly :( ___

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2013-12-21 22:26:08 (0 comments, 0 reshares, 12 +1s)Open 

Well, I love Terry Pratchett's take on why Santa (or the Hogfather) is important:

"All right," said Susan. "I'm not stupid. You're saying humans need... fantasies to make life bearable."

REALLY? AS IF IT WAS SOME KIND OF PINK PILL? NO. HUMANS NEED FANTASY TO BE HUMAN. TO BE THE PLACE WHERE THE FALLING ANGEL MEETS THE RISING APE.

"Tooth fairies? Hogfathers? Little—"

YES. AS PRACTICE. YOU HAVE TO START OUT LEARNING TO BELIEVE THE LITTLE LIES.

"So we can believe the big ones?"

YES. JUSTICE. MERCY. DUTY. THAT SORT OF THING.

"They're not the same at all!"

YOU THINK SO? THEN TAKE THE UNIVERSE AND GRIND IT DOWN TO THE FINEST POWDER AND SIEVE IT THROUGH THE FINEST SIEVE AND THEN SHOW ME ONE ATOM OF JUSTICE, ONE MOLECULE OF MERCY. AND YET—Death waved a hand.AND... more »

Well, I love Terry Pratchett's take on why Santa (or the Hogfather) is important:

"All right," said Susan. "I'm not stupid. You're saying humans need... fantasies to make life bearable."

REALLY? AS IF IT WAS SOME KIND OF PINK PILL? NO. HUMANS NEED FANTASY TO BE HUMAN. TO BE THE PLACE WHERE THE FALLING ANGEL MEETS THE RISING APE.

"Tooth fairies? Hogfathers? Little—"

YES. AS PRACTICE. YOU HAVE TO START OUT LEARNING TO BELIEVE THE LITTLE LIES.

"So we can believe the big ones?"

YES. JUSTICE. MERCY. DUTY. THAT SORT OF THING.

"They're not the same at all!"

YOU THINK SO? THEN TAKE THE UNIVERSE AND GRIND IT DOWN TO THE FINEST POWDER AND SIEVE IT THROUGH THE FINEST SIEVE AND THEN SHOW ME ONE ATOM OF JUSTICE, ONE MOLECULE OF MERCY. AND YET—Death waved a hand. AND YET YOU ACT AS IF THERE IS SOME IDEAL ORDER IN THE WORLD, AS IF THERE IS SOME...SOME RIGHTNESS IN THE UNIVERSE BY WHICH IT MAY BE JUDGED.

"Yes, but people have got to believe that, or what's the point—"

MY POINT EXACTLY.” 
― Terry Pratchett, Hogfather___

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2013-12-20 18:37:37 (1 comments, 0 reshares, 8 +1s)Open 

+Kristian Jerslev I know you already have one but still! Nice! It's on my wishlist..

+Kathrine Dahl +Jens Riggelsen +Mads Lundbak Severinsen +Dennis Kikkenborg Pedersen +LEGO 

+Kristian Jerslev I know you already have one but still! Nice! It's on my wishlist..

+Kathrine Dahl +Jens Riggelsen +Mads Lundbak Severinsen +Dennis Kikkenborg Pedersen +LEGO ___

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2013-12-15 12:19:05 (0 comments, 0 reshares, 9 +1s)Open 

The first successful soft landing on the Moon in 37 years. Well done China, http://www.planetary.org/blogs/emily-lakdawalla/2013/12140619-change-3-has-successfully-landed.html.

The first successful soft landing on the Moon in 37 years. Well done China, http://www.planetary.org/blogs/emily-lakdawalla/2013/12140619-change-3-has-successfully-landed.html.___

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2013-12-14 15:35:53 (0 comments, 0 reshares, 5 +1s)Open 

Google celebrates Tycho Brahes birthday with a Doodle today. Very nice. They even got his copper nose (Tycho's nose was chopped off during a duel, and he wore a copper nose for most his life. He also had one of silver, for party occasions). He made the first astronomic atlas since Hipparchus in ancient Greece, invented quite some instruments (and especially how to construct precise rulers) he was one of the first to use averages to gather better results, discovered that the heavens are not unchangeable (he saw what he thought was the birth of a new star. In reality a Supernova"  and coined what is known as the first rule of physics "By looking down I see up, and by looking up I see down" or "The laws of physics are universal" 

Google celebrates Tycho Brahes birthday with a Doodle today. Very nice. They even got his copper nose (Tycho's nose was chopped off during a duel, and he wore a copper nose for most his life. He also had one of silver, for party occasions). He made the first astronomic atlas since Hipparchus in ancient Greece, invented quite some instruments (and especially how to construct precise rulers) he was one of the first to use averages to gather better results, discovered that the heavens are not unchangeable (he saw what he thought was the birth of a new star. In reality a Supernova"  and coined what is known as the first rule of physics "By looking down I see up, and by looking up I see down" or "The laws of physics are universal" ___

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2013-12-08 15:34:02 (0 comments, 0 reshares, 3 +1s)Open 

Second grade. I had changed school. Second day, I walk into the wrong classroom (I think it was a fifth grade), sit down, and denies being in a wrong classroom, trying to excuse being new. But it was wrong... I was 6 and I still remember the feeling... sob..

Second grade. I had changed school. Second day, I walk into the wrong classroom (I think it was a fifth grade), sit down, and denies being in a wrong classroom, trying to excuse being new. But it was wrong... I was 6 and I still remember the feeling... sob..___

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2013-12-08 14:02:07 (0 comments, 0 reshares, 2 +1s)Open 

Best usage og Doge so far

Wormholes, Entanglement and Holograms, Oh My!

You may have heard about how quantum particles are wormholes, or holographic somethings.  Whatever.  It’s quantum wormhole things that, well, do something.  So what’s all the hype really about?

It all stems from a recent paper in Physical Review Letters (paywalled, but arxiv to the rescue: http://goo.gl/Z0gez3) dealing with entangled particles and their connection of their holographic duals to wormhole geometries.  So let’s start with a little background.

Entanglement is a well-known property of quantum mechanics.  It is perhaps most famously demonstrated through the Einstein-Podolsky-Rosen (EPR) experiment.  Suppose we have a mischievous mutual friend.  She decides to prank us by sending sending each of us one member of a pair of gloves.  She packs each glove in a box and mails one to each of us.  We find out about the prank, so we both know that we’re getting one glove of a pair.  But until either of us open our respective box, neither of us know which glove we have.  Once the box arrives at your door, you open it up, and find you have the left glove.  At that moment you know I must have the right glove.  

This is the basic idea of the EPR experiment.  For gloves it isn’t a big deal, because from the get-go the left glove was heading your way.  You just didn’t know you were getting the left glove.  That’s because gloves are not quantum things.  In the quantum regime, things get much more strange.  In quantum theory, things can be in an indefinite state until you observe them.  It would be as if our boxes contained a pair of something (gloves, shoes, salt and pepper shakers, etc.) but it is impossible to know what specific something until one of us opens their box.  

In quantum theory we would say the boxes contain a superposition of possible things, and the outcome only becomes definite when the outcome is observed.  Now even though you can’t know what specific object you have, you know that I must have its pair.  So if you open the box to find a red right shoe, you know immediately that I must have a red left shoe.  We both know this without opening the box, so we can say that the outcomes of opening our boxes are entangled.  Knowing the contents of one box tells us the contents of the other.  We’ve actually done this experiment with photons, atoms and the like, and it really works.  

Of course this is really hard to wrap your head around.  If I’m thousands of miles away from you, and I open my box to find a salt shaker, I know you must have a pepper shaker.  But your box couldn’t have known that until I opened the box.  How is that possible?  How can the opening of my box instantly affect your box thousands of miles away?  Do the boxes communicate faster than light? (No.)  Is there some secret (hidden variable) so that the boxes know what they will become when observed? (No.)  That is part of what makes entanglement so strange, and the EPR experiment so popular.  The one thing we can say is that entanglement is a very real physical effect in quantum mechanics.  There isn’t anything magical going on, just something we humans find strange.

Wormholes come from general relativity.  Unlike entanglement, there is no experimental evidence for wormholes.  Instead, they are a hypothetical connection between two locations in space.  Normally when people think of wormholes, they think of something out of science fiction (http://goo.gl/nz5SV2) where people use wormholes to travel to distant stars, but the hypothetical wormholes in general relativity aren’t traversible, nor do they have to be large.

This particular paper is looking at how there might be a connection between wormholes and quantum particles.  This idea isn’t new, in fact the idea that fundamental particles could be wormholes dates back to the 1950s, when John Wheeler proposed a model known as geometrodynamics, where everything was empty space and charged particles were the mouths of wormholes.  Wheeler was an excellent physicist known for coming up with a lot of wild ideas, some of which worked, and some of which didn’t.  In the case of geometrodynamics, it never really worked, and after a while interest faded.

But with the rise of string theory, different versions of the idea have gained some popularity.  Hence this new paper.  What the authors did was to look at a specific case of the EPR experiment, dealing with two quark particles.  What they were able to show is that the entangled quarks can be described in two ways.  The first is the standard way in which entanglement is described in quantum theory, but the second (dual) way is as two particles connected by a wormhole.  Both of these descriptions are equivalent.  

Does this mean that entangled particles are wormholes?  No.  What it means is that there is an interesting connection between the mathematics of entanglement and the mathematics of quantum wormholes.  Just to be clear, this has nothing to do with any new experimental evidence.   But it is interesting, because it shows a connection between quantum entanglement and general relativity, and that may lead the way toward a better understanding of quantum gravity.

Image:  “Doge Meme” from Know Your Meme (http://goo.gl/Wv2n4l), with text added.  Originally posted on Reddit by papajohn56 (http://goo.gl/Q7MFhE).

Paper:  Jensen K, Karch A. Holographic Dual of an Einstein-Podolsky-Rosen Pair has a Wormhole. Phys. Rev. Lett. 2013;111(21)___Best usage og Doge so far

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