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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
make repairs. This means that you have to make sure that the floor of the
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In some cases, it’s harder to get to, which
will increase labor costs. 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
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There they could await rescue. Although such a mission wouldn't endanger the lives of humans, there were other considerations that made it a difficult decision.
But there was also a downside to using a
robot. The robot featured two long, multi-jointed arms
that were capable of performing several basic tasks.
The two defunct cameras include a wide field camera
and a high-resolution camera. An electrical short circuit disabled two of the three cameras.
The ACS has three cameras and has taken some of the most impressive
images of objects in deep space.
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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