STS109-E-5630 (5 March 2002) --- With the Space Shuttle Columbia in limited natural light, two astronauts work on the Hubble Space Telescope (HST) during the flight's second of five scheduled space walks. A thin slice of reflected sunlight and airglow can be seen at Earth's horizon. Astronauts James H. Newman (out of frame) and Michael J. Massimino (on platform on end of robotic arm), mission specialists, are making their first extravehicular activity (EVA) of the mission, following the act of two other crewmembers on the previous day. The image was recorded with a digital still camera.