STS109-E-5627 (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 and Michael J. Massimino, mission specialists, are making their first extravehicular activity (EVA) of the mission, following the act of two other crewmembers on the previous day. Massimino can be identified on the end of the arm by the diagonal stripes on the pant legs of his extravehicular mobility unit (EMU) space suit. The image was recorded with a digital still camera.