Editor's choices for the most educational Astronomy Pictures of the Day about aurora. #astronomy
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A Memorable Aurora Over Norway (Dec 5 2011) Image Credit & Copyright: Ole Christian Salomonsen It was one of the most memorable auroras of the season. There was green light, red light, and sometimes a mixture of the two. There were multiple rays, distinct curtains, and even an auroral corona. It took up so much of the sky. In the background were stars too numerous to count, in the foreground a friend trying to image the same sight. #astronomy

APOD: 2011 December 5 - A Memorable Aurora Over Norway

A Full Sky Aurora Over Norway (Jan 3 2012) Image Credit & Copyright: Sebastian Voltmer Higher than the highest building, higher than the highest mountain, higher than the highest airplane, lies the realm of the aurora. Auroras rarely reach below 60 kilometers, and can range up to 1000 kilometers. Aurora light results from energetic electrons and protons striking molecules in the Earth's atmosphere. #astronomy

APOD: 2012 January 3 - A Full Sky Aurora Over Norway

January Aurora Over Norway (Jan 24 2012) Image Credit & Copyright: Bjørn Jørgensen What's that in the sky? An aurora. A large coronal mass ejection occurred on our Sun five days ago, throwing a cloud of fast moving electrons, protons, and ions toward the Earth. Although most of this cloud passed above the Earth, some of it impacted our Earth's magnetosphere and resulted in spectacular auroras being seen at high northern latitudes. #astronomy

APOD: 2012 January 24 - January Aurora Over Norway

Planet Aurora Borealis (Jan 28 2012) Image Credit & Copyright: Göran Strand Illuminated by an eerie greenish light, this remarkable little planet is covered with ice and snow and ringed by tall pine trees. Of course, this little planet is actually planet Earth, and the surrounding stars are above the horizon near Östersund, Sweden. The pale greenish illumination is from a curtain of shimmering Aurora Borealis also known as the Northern Lights. #astronomy

APOD: 2012 January 28 - Planet Aurora Borealis

Red Aurora Over Australia (Feb 1 2012) Credit & Copyright: Alex Cherney (Terrastro, TWAN) Why would the sky glow red? Aurora. Last week's solar storms, emanating mostly from active sunspot region 1402, showered particles on the Earth that excited oxygen atoms high in the Earth's atmosphere. As the excited element's electrons fell back to their ground state, they emitted a red glow. Were oxygen atoms lower in Earth's atmosphere excited, the glow would be predominantly green. #astronomy

APOD: 2012 February 1 - Red Aurora Over Australia