... the two previous satellites. In their effort to benefit from the international astronomical researches and studies, the scientists decided to operate the HST as a long-lived and permanent space-based unit. In order to carry out the missions and protect the spacecraft against instrument and equipment failures, NASA set up regular servicing missions. It might seem a little bit odd that scientists ... the very deep red. Light entering the instrument first passed through an aperture wheel with a variety of possible settings; point sources could be viewed through round or square apertures fr...

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