ESA astronaut Alexander Gerst took this image circling Earth on the International Space Station during his six-month Blue Dot mission.
Alexander commented: "Never would have thought I would fly right through an aurora. I made a wish, just in case it's an undiscovered rule"
Read more about the Blue Dot mission at http://www.esa.int/Our_Activities/Human_Spaceflight/Blue_dot
Follow Alexander via alexandergerst.esa.int