Space

"3 second shutter exposure at night shows how crazy our atmosphere really is" - Reid Wiseman

Photographed by Alexander Gerst on the ISS

via http://www.esa.int/spaceinimages/Images/2014/08/Saturn_s_moon_Rhea_Epimetheus_transiting

via http://www.reddit.com/r/spaceporn/comments/2d47z3/my_summer_work_ngc_7000_in_narrowband_3840_x_2610/

Airglow is the very weak emission of light by a planetary atmosphere.

Backdropped against the Andes Mountains near the border of Argentina and Chile, making its relative approach to the International Space Station, from which this photo was taken