Bouncing across the moon’s bleak, gray surface, 12 astronauts gathered hundreds of pounds of moon rock between 1969 and 1972.
Sometimes, they lifted blocks as heavy as 25 pounds (in Earth weight) off the lunar surface. Other times, they raked the lunar floor to collect fine, meteorite-smashed soil. In total, NASA flew 842 pounds of extraterrestrial rock back to Earth. Most of it has since been sealed away in freezing vaults.