The theory that the moon formed when a planet-sized body named Theia crashed into Earth is supported by new evidence using samples from Apollo missions.
Once they looked, astronomers began finding many asteroids near Earth. The one passing Sunday, June 8 is an especially big one, found only two months ago.
Intense light from an enormous star explosion more than 12 billion years ago — shortly after the Big Bang — recently reached Earth and was visible in the sky.
On Tuesday, NASA was going to drop a flying-saucer-shaped vehicle from a helium balloon high above Earth's surface, in preparation for future Mars missions. But the test has been delayed, due to weather.