Earth's thin atmosphere, 地球稀薄的大氣層

Earth's thin atmosphere stands out against the blackness of space in this photo shared by NASA astronaut Scott Kelly on board the International Space Station.
September 1, 2015
http://www.voanews.com/media/photogallery/september-1-2015-day-in-photos/2941066.html

Atmosphere - Wikipedia, the free encyclopedia

大氣層