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In 2004, the Hubble's Space Telescope Imaging Spectrograph (STIS)
malfunctioned when its power supply failed. The next option was to send up
a manned space mission and use astronauts to manually replace, upgrade
and repair the Hubble's systems. While NASA resumed the space
shuttle program in the summer of 2005, there were
no plans to repair or upgrade the Hubble. Was there some other way to
repair the telescope without subjecting humans to danger?
For one thing, engineers designed the Hubble so that humans could make repairs and upgrades, so the
robot would have to mimic a human's range of motion in space.
The third option was to send up a robot to the Hubble telescope to
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NASA had to weigh the costs of developing a robot with the benefits of having the Hubble back online.
Would the benefits of fixing the Hubble outweigh the risk and cost of a manned mission? The Hubble maintains its orientation using a complex navigational
system. This system in turn relies on six gyroscopes, which help the Hubble maintain its orientation in relation to the Earth.
NASA considered just letting the Hubble die, but an enthusiastic outcry from the scientific community caused NASA officials to reconsider.
With that in mind, NASA has scheduled regular maintenance and repair missions to keep the Hubble in working order since
its launch. If they aren't replaced, the Hubble
will lose power and stop functioning. Say that you have a Range Rover, how will
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If NASA chose not to act, the Hubble would likely fail before 2009. NASA would be unable to gather the kind of information and images the Hubble was designed to collect until a replacement telescope could launch -- something that isn't scheduled to happen until 2013. That means the Earth's gravity would gradually pull the telescope closer to the planet. Left alone, the telescope would reenter the Earth's atmosphere and crash to Earth. For a few years, NASA was unwilling to support a manned mission to repair the telescope. Instead, NASA would likely send up a mission, either manned or unmanned, to retrieve the telescope safely or crash it into an unpopulated area, such as an ocean. NASA probably wouldn't let that happen on its own -- it would be too dangerous without knowing where the telescope would land. Besides the mission in 1993 to install the correctional device to address the mirror problem, NASA scheduled three more missions to upgrade and maintain the telescope.
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