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The Hubble Space Telescope was designed to
be upgraded and repaired throughout its life.

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And after its launch in 1990, this fact became
very important.

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When Hubble’s first pictures came back to
Earth, they didn’t look quite right.

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The images were blurred and out of focus,

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because Hubble's primary mirror had been ground too flat.

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In 1993, Hubble’s first servicing mission
was launched:

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They installed Wide Field and Planetary Camera
2, which compensated for the mirror’s imperfection.

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Astronauts also added the Corrective Optics
Space Telescope Axial Replacement, or COSTAR.

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It almost acted like a pair of glasses for
the primary mirror, fixing the image focus

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for the rest of Hubble’s science instruments.

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They also installed new solar panels, and
replaced failing gyroscopes and magnetometers

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so that the telescope’s orientation could
remain accurate.

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After Servicing Mission 1’s completion,
Hubble was able to fulfill its original expectations

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and much more.

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Without it, Hubble and NASA may not be where
they are today more than 30 years later.