One Moon rock brought back to Earth in 1969 was returned to the Moon two and a half years later. Initially, scientist were surprised to find that many lunar samples were magnetic. However, they could not be certain that samples had not become magnetized while aboard the Apollo spacecraft during the journey back to Earth. To test this, one Apollo 12 sample was demagnetized and taken back to the Moon aboard Apollo 16, where it was reanalyzed. It was found to be unaffected by the journey, confirming magnetism as a property of the Moon and not of the spacecraft. After the experiment, the rock was left behind, making it the only native lunar object to temporarily visit another world.
12:16 pm • 10 September 2012 • 82 notes