Before drifting off to sleep tonight aboard the International Space Station, astronaut Scott Kelly (stationcdrkelly) posted this image and wrote, "Day 123. Just when I think sunrise is as good as it gets, I see sunset. Good night from ISS! #YearInSpace" Kelly is living and working off the Earth, for the Earth aboard the station for a yearlong mission. Traveling the world more than 220 miles above the Earth, and at 17,500 mph, he circumnavigates the globe more than a dozen times a day. Image Credit: NASA #nasa #iss #spacestation #space #isscrew