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  • Gravity Probe B spacecraft is shown in orbit around the Earth, as viewed by a camera mounted on the second stage of the Delta II rocket that carried it to space.

    › Gravity Probe B in Orbit

  • Artist concept of the Gravity Probe B spacecraft

    › Gravity Probe B in Orbit

  • Gravity Probe B spacecraft launches from Vandenberg Air Force Base on April 20, 2004.

    › Gravity Probe B Launch

  • Artist concept of the Gravity Probe B spacecraft

    › Gravity Probe B

  • Computer-designed artist rendering of the Gravity Probe B space vehicle

    › Gravity Probe B

  • The Gravity Probe B flight dewar will maintain the experiment at a temperature just above absolute zero, staying cold for two years.

    › Dewar

  • The Gravity Probe B fused-quartz block, which houses the four fused-quartz gyroscopes

    › Quartz Block

  • Prototype of the Gravity Probe B quartz block

    › Quartz Block

  • Gravity Probe B's gyroscope rotor

    › Gyroscope Rotor

  • Image of an uncoated quartz rotor and half a housing on a sheet of diamond-plate steel.

    › Gyroscope

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