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​​Launched in 1990, NASA’s Hubble Space
Telescope has investigated some of the most

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compelling mysteries of the universe.

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Technology advanced in the seven years after
Hubble’s launch, offering NASA the opportunity

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to upgrade Hubble during its Second Servicing
Mission in February 1997.

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During five spacewalks, astronauts installed
the Space Telescope Imaging Spectrograph,

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or STIS, a new versatile tool for studying
visible and ultraviolet light.

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They also added the Near-Infrared Camera and
Multi-Object Spectrometer, or NICMOS, which

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allowed researchers to gaze further from Earth
and farther back in time than ever before

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thanks to its infrared-detecting capabilities.

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Along with the new instruments, astronauts
equipped the telescope with a refurbished

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fine guidance sensor and a new data recorder,
replaced its gyroscopes and solar arrays,

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and repaired its damaged insulation.

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These activities extended Hubble's lifetime,
while STIS and NICMOS expanded humanity’s

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view of the universe.