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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
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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.
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services in India. 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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