The Rate Sensor Units allow the Telescope to point at stars, planets and other celestial targets. There are three aboard Hubble, and each unit contains two gyroscopes. Hubble needs three of these six gyroscopes to meet its very precise pointing requirements, and the other three are spares. Astronauts will replace all three units, leaving Hubble with six fresh gyroscopes.
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Johnson Space Center
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NASA
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The Rate Sensor Units allow the Telescope to point at stars, planets and other celestial targets. There are three aboard Hubble, and each unit contains two gyroscopes. Hubble needs three of these six gyroscopes to meet its very precise pointing requirements, and the other three are spares. Astronauts will replace all three units, leaving Hubble with six fresh gyroscopes.