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Servicing Mission 4’s goal was to bring
Hubble's scientific capability to its peak

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performance.

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But safety concerns after the tragic loss
of the Space Shuttle Columbia and its crew

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in 2003 canceled the mission.

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After 2 years of safety review and study,
NASA administrator Michael Griffin had an

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exciting announcement:

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“We are going to add a shuttle servicing
mission to the Hubble Space Telescope to the

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shuttle manifest to be flown before it retires.”

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Finally, the Space Shuttle Atlantis launched,
and Hubble’s final servicing mission began

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.

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Astronauts installed 2 new science instruments,
brought 2 others back to life, replaced gyroscopes

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and batteries, installed new insulation, and
added a soft-capture mechanism.

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Servicing Mission 4 left Hubble scientifically
more powerful than ever before.

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Today Hubble observations continue to change
our understanding of the universe and its

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journey of discovery is expected to last for
years to come.