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Aurora Boreal. Alaska

Portage Persistence by Carl Johnson, Portage Valley, Chugach National Forest, Alaska, March 2013

Excited to Ground State by Ole C Salomonsen. The aurora borealis over mountains in Ulsfjord, Norway. The title refers to the physics behind this dazzling natural lightshow. Particles in the solar wind collide with gas molecules high in Earth’s atmosphere, transferring some of their energy and boosting the molecules' electrons into an ‘excited’ state. As the electrons return to their normal or ‘ground’ state, the molecules emit light of a characteristic colour: green for oxygen and red for…

Astronomy Photographer of the Year 2011 shortlist – in pictures

Excited to Ground State, photo by Ole C Salomonsen for The Royal Observatory, UK. The aurora borealis over mountains in Ulsfjord, Norway

"A verdade é sempre a ser encontrada na simplicidade, e não na multiplicidade e confusão das coisas."

"A verdade é sempre a ser encontrada na simplicidade, e não na multiplicidade e confusão das coisas."

The rarest of the Northern Lights, red.

The rarest of the Northern Lights, red. I saw the red ones years ago. At first I didn't think they were an aurora because they were red. They were absolutely stunning.

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