Balloon-borne telescope

A balloon-borne telescope is a sub-orbital astronomical telescope that is suspended below one or more stratospheric balloons, allowing it to be lifted above the lower, dense part of the Earth`s atmosphere. This has the advantage of improving the resolution limit of the telescope at a much lower cost than for a space telescope. It also allows obse....
Found on http://en.wikipedia.org/wiki/Balloon-borne_telescope
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