The setting sun lights up the the neon blue line of Earth’s atmosphere in this photo taken by the crew of the International Space Station during the STS-129 shuttle mission.
Click for the full-size view.
The darkness of space above and a dark night on Earth below, this “thin blue line” is all that exists of the seemingly endless ocean of sky we see above us every day. I am always stunned by its fragility when seen from a distance.
This was NASA’s Image of the Day today, November 25.