A free screensaver that displays 21 high quality images taken by the Hubble Space Telescope. The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble.
Its position outside the Earth's atmosphere provides significant advantages over ground-based telescopes - images are not blurred by the atmosphere, there is no background from light scattered by the air, and the Hubble can observe ultra-violet light that is normally absorbed by the ozone layer in observations made from Earth.
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