NASA's Galileo spacecraft took this image of the Moon on December 7, 1992, showing the bright Tycho crater at the bottom. This image, captured by Lunar Orbiter 2, shows Copernicus crater on the Moon ...

In the early seventeenth century, Copernicus' concept of a heliocentric ... to the ground was also responsible for keeping the moon in orbit around the earth, and the planets in orbit around ...

Apollo 15: Astronaut James B. Irwin, lunar module pilot, works at the Lunar Roving Vehicle during the first Apollo 15 lunar surface extravehicular activity (EVA) at the Hadley-Apennine landing site.