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Anna Richards
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Article Insight:
'When an Antarctic iceberg the size of a country breaks away, what happens next?'
by Mark Brandon
 
#iceberg #Antarctic #environment #climate #science 
A massive glacier tongue sticking out off the edge of the continent has been snapping off every 70 years.
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Eclipse 20-03-2015 (Central Poland)
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Camilla Corona originally shared:
 
Introduction into Aurorae - Part IV

Are you bored yet? I hardly think so...let's keep learning about why we see these magical lights.

The aurora is caused by the interaction of highenergy particles (usually electrons) with neutral atoms in the Earth’s upper atmosphere. These high energy particles can “excite” (by collisions) valence electrons that are bound to the neutral atom. The excited electrons can then return to their initial, lower energy state, and in the process release photons (light particles). This process is similar to the discharge in a neon lamp.

Any particular color of the aurora depends on a specific atmospheric gas and its electrical state, and on the energy of the particle that hits the atmospheric gas. Atomic oxygen is responsible for the two main colors of green (wavelength of 557.7 nm) and red (630.0 nm).
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Randy Halverson originally shared:
 
Another lightning shot from last July in South Dakota.
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So much for my idealistic vision of common heritage of mankind...
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Randy Halverson originally shared:
 
Colorado - Canyon of the Ancients area last summer.
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A Flag Shaped Aurora over Sweden
Image Credit & Copyright: Mia Stålnacke
http://apod.nasa.gov/apod/ap150330.html

It appeared, momentarily, like a 50-km tall banded flag. In mid-March, an energetic Coronal Mass Ejection directed toward a clear magnetic channel to Earth led to one of the more intense geomagnetic storms of recent years. A visual result was wide spread auroras being seen over many countries near Earth's magnetic poles. Captured over Kiruna, Sweden, the image features an unusually straight auroral curtain with the green color emitted low in the Earth's atmosphere, and red many kilometers higher up. It is unclear where the rare purple aurora originates, but it might involve an unusual blue aurora at an even lower altitude than the green, seen superposed with a much higher red. As the Sun continues near its top level of surface activity, colorful nights of auroras over Earth are likely to continue.
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What happens when a Coronal Mass Ejection hits the Earth?
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Fraser Cain originally shared:
 
Weekly Space Hangout for Jan. 26th, 2012

Another edition of our weekly space hangout. This week we talked about a week of space remembrance, solar storms, Newt's plans for a 2020 lunar base, arsenic and old news, black holes and their galaxies and the death of Phobos-Grunt.

We were joined by +Philip Plait, +Pamela Gay, +Alan Boyle, +Nicole Gugliucci and +Ian O'Neill.
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Universe Today originally shared:
 
The internets to the rescue for seeing the aurora!
With the recent solar activity producing blasts of subatomic particles from the Sun to Earth’s magnetic field, the social media outlets are buzzing with those who are seeing auroral activity in their ...
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Emily Lakdawalla originally shared:
 
At last: Rosetta's Mars flyby photos have been released!
Permalink: http://www.planetary.org/blog/article/00003340/
On February 24, 2007, the European Space Agency's Rosetta spacecraft passed by Mars, the second of four planetary gravity-assist flybys on its long route to a 2014 rendezvous with comet Churyumov-...
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Fraser Cain originally shared:
 
Fraser Cain is hanging out with 1 person right now in a live Hangout On Air!Pamela Gay
Fraser Cain's profile photoPamela Gay's profile photo
Fraser Cain was in a video call with 1 other
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Strange dark stuff is making the universe too bright - space - 17 July 2...
www.newscientist.com

Sky surveys suggest that dark matter or some other mysterious dark material may be lighting up the universe with too much ultraviolet radiat

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Sklep internetowy Merlin.pl poleca: Filmy, multimedia, prezenty, książki, zabawki, kosmetyki, moda, muzyka, elektronika, sport

The Mysterious Case of the Disappearing Dust - NASA Jet Propulsion Labor...
www.jpl.nasa.gov

Astronomers have discovered that vast amounts of planetary dust, enough to fill the inner portions of a solar system, have suddenly vanished

Postcards From Saturn
www.universetoday.com

Over the past few days NASA's Cassini spacecraft has performed flybys of several of Saturn's moons. From the ostentatious Enceladus with i

The Most Astounding Fact (Neil DeGrasse Tyson)
www.youtube.com

Most footage is either real or based on actual data. Astrophysicist Dr. Neil DeGrasse Tyson was asked by a reader of TIME magazine, "What is