Neil Armstrong and Buzz Aldrin were supposed to sleep prior to liftoff. But how could they?
A scientist says he has figured out a way to forecast solar storms up to one hour before they strike Earth.
No less than 11 meteors smacked into the Moon during December's Geminid meteor shower, NASA astronomers have found.
Something remarkable is about to happen in the evening sky. Three planets and a star cluster are converging for a close encounter you won't want to miss.
The Sun's Great Conveyor Belt has slowed to a record-low crawl, with important repercussions for future solar activity.
One of the strangest satellites in the history of the space age is about to go into orbit. Launch date: Feb. 3.
NASA's Gravity Probe B spacecraft has gathered all the data physicists need to check a bizarre prediction of Einstein's relativity.
Earth is orbiting through a swarm of space debris that may be producing an unusual number of nighttime fireballs.
The largest proton storm in years bathed the Moon in radiation. With no atmosphere, it's a dangerous place for astronauts.
Would you like to see a piece of Halley's Comet streak past a planet that looks like an exploding star? No problem. Just set your alarm.
At precisely 8:52:46 a.m. Pacific Daylight Time (PDT), a white-hot dot of light will begin to glide across the blue morning sky.