The Earth as You've Never Seen it Before: Atmosphere, Airglow and Aurora from top bottom Watch Video
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Description: A truly powerful image generates questions.nnThe incredible night photos and time-lapse movies NASA has been sharing with us provoke questions about our planet. That thin-yellow atmospheric line separating earth from space, for example, that we see in all of the night shots provokes two questions: (1) how thick is this line? and (2) why is this line colored the way it is?nnThe visible yellow and green/blue capped line represents atmosphere reaching ~100km above the surface of the earth. The colo