FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY
Hubble Space Telescope (HST), computer artwork. The HST is an astronomical satellite in orbit around Earth. It observes stars, galaxies and other astronomical objects. It measures wavelengths in a range of the electromagnetic spectrum that covers infrared, ultraviolet and visible light. This information enables astronomers to determine the physical characteristics of distant objects. HST was launched by the Space Shuttle Discovery in 1990, and orbits at a height of around 600 kilometres.
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