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06-20-2008, 04:39 PM
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COSTAR - The Hubble Space Telescope's Contact Lens
Remember all the hullaballoo over the Hubble Space Telescope (HST) and it's flawed optics? Well, the solution was, of course, a contact lens.
Like everything else at NASA, there has to be a cute, capitalized acronym. (The Agency is even rumored to have a BOA - a Book of Acronyms.) The contact lens is called COSTAR, which stands for the equally catchy Corrective Optics Space Telescope Axial Replacement. In December 1993, astronauts flew to the HST on the space shuttle Endeavour, carrying COSTAR and the tools to install it. COSTAR consists of five small mirrors that intercept the beam from the flawed mirror, correct the defect, and then relay the corrected beam to the scientific instruments at the focus of the mirror. The procedure, although risky for the astronauts performing the installation, was completed without a hitch. And now the HST is taking pictures that drop the jaws of even veteran astronomers. 
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