Skylab

Skylab was an American space station. It began its return to Earth on 11 July 1979, several years ahead of schedule. (PROSE: The Time Traveller's Almanac)

In 1979, the now-abandoned Skylab was used by the Zalphons as their base, but an accident on board caused it to crash back to Earth, the debris falling in Western Australia. The Tenth Doctor, with the assistance of young Harvey, defeated the Zalphons. (PROSE: Bennelong Point) At some point prior to his travels with Rose Tyler, the Doctor helped bring Skylab to Earth. He nearly took off his thumb in doing so. (TV: Tooth and Claw)

One piece of Skylab nearly killed Paul Forbes, who was in the Gibson Desert, but he was saved when the Seventh Doctor advised him to take three steps to the left. (PROSE: Three Steps to the Left)