Aurora Borealis from space. View from the International Space Station (ISS) of the Aurora Borealis,or northern lights over Finland,Russia,Estonia and Latvia. Auroral displays are caused by interactions between energetic charged particles from the Sun,and the Earth's atmosphere. Moving at 400-500 kilometres a second,the charged particles of the solar wind are drawn by Earth's magnetic field to the poles,where they collide with gas atoms and molecules,causing them to emit light. Green light is from oxygen atoms. The displays can be hundreds of kilometres above the Earth | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / NASA |
Taille de l’image : | 2350 px × 1524 px |
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