The Hubble Space Telescope is very big — about the size of a large school bus or tanker truck. The tubular part of Hubble's body is 14 feet across, and the telescope stands 43 feet tall — about as high as a five-story building. On the ground, it would weigh over 25,000 pounds, but in space it weighs nothing. When the space shuttle Discovery carried Hubble into orbit, the telescope completely filled Discovery's cargo bay. Hubble is pictured in Discovery's cargo bay during the December 1999 servicing mission.     
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