Keep to the vision

摘要

Perhaps the most memorable achievement of the US space shuttle fleet was Endeavour's, first servicing mission to the Hubble Space Telescope in December 1993. Here was something that only humans in space could achieve - the gentle snagging of the satellite with the shuttle's arm; the five spacewalks to install corrective optics, new instruments, gyrosocopes and solar panels; and finally, the release of a clear-eyed telescope capable of discerning finer details, deeper in the cosmos, than any other telescope in history.