The Hubble Space Telescope is a 2.4 meter telescope in space.
To find images and more information about the Hubble Space Space Telescope, click to this page by NASA.
Because HST is located in space, and above the Earth's atmosphere, it has two advantages over ground based telescopes:
Observations can be made at wavelengths that are blocked by the atmosphere from the ground, particularly in the ultraviolet.
A nice comparison of ground and space based images of the globular cluster NGC 6624 is available in the SEDS HST archive.
"We Nailed It! A First Look at the New and Improved Hubble Space Telescope", Stephens, S. 1993, Mercury Jan-Feb, p6.
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