Cernan flew in space three times, took the second American spacewalk, and was just as thrilled to walk on the moon as if he had been the first to do it.
During the rare event, the waning gibbous moon will pass over the huge, bright orange star of Aldebaran. It'll be visible across large portions of the South and the Northeastern United States.
Astronomers have found about 2,000 planets beyond our solar system. Now, some scientists are expanding the search to look for distant moons, too, in the hunt for signs of life.
When a company named Astrobotic launches a lunar rover in 2017, the MoonArk will be aboard. It's a lightweight, sturdy "portrait of humanity," carrying the work of more than 200 artists and designers.
NK-33 engines, originally destined for a Soviet-era moon shot that never got off the ground and later used in the Antares, are suspect, some scientists say.