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The Magellan spacecraft with its attached Inertial Upper Stage booster is in the orbiter Atlantis payload bay prior to closure of the doors at T-3 days to launch from pad 39B. Launch of Magellan and Space Shuttle Mission STS-30 was targeted for Friday, April 28, 1989, but was scrubbed at T-31 seconds. After repairs were made the launch happened on May 4, 1989. Magellan entered orbit around Venus on August 10, 1990. During its four years in orbit around Earth's sister planet, the spacecraft has radar-mapped 98 percent of the surface and collected high-resolution gravity data of Venus. The mission came to an end when the probe was commanded to plunge into the planet's dense atmosphere Tuesday, October 11, 1994.