est100 一些攝影(some photos): iconic images, from space. 標誌性的圖像, 從太空

Users can search through 140,000 images, videos and audio files across the agency's missions in aeronautics, astrophysics, Earth science, human spaceflight and more. Pictured is astronaut Scott Kelly taking a quick space selfie during his first ever spacewalk on Oct 28, 2015