A Delta II rocket launched from here April 20. The rocket carried the Gravity Probe-B experiment, a project between NASA and Stanford University to test Einstein's theory of relativity. The experiment will check tiny changes in four gyroscopes on a satellite orbiting 400 miles directly above Earth's poles. Scientists will use the experiment to measure how space and time are warped by Earth's presence.

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A Delta II rocket launched from here April 20. The rocket carried the Gravity Probe-B experiment, a project between NASA and Stanford University to test Einstein's theory of relativity. The experiment will check tiny changes in four gyroscopes on a satellite orbiting 400 miles directly above Earth's poles. Scientists will use the experiment to measure how space and time are warped by Earth's presence.

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