Tony Phillips

Neil Armstrong and Buzz Aldrin were supposed to sleep prior to liftoff. But how could they?

A puzzling surplus of high-energy electrons is bombarding Earth from space.

NASA astronomers have observed the Moon flashing a hundred times.

Astronomers notice Saturn's rings narrowing.

NASA scientists capture strange sunspot activity on magnetogram.

A scientist says he has figured out a way to forecast solar storms up to one hour before they strike Earth.

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.

Astronomers will soon get a second chance to view a comet that broke apart in 1995.

Backyard astronomers, grab your telescopes. Jupiter is growing a new red spot.

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.

They both resonate. That's good for a guitar, bad for a rocket. Learn more.

Earth is orbiting through a swarm of space debris that may be producing an unusual number of nighttime fireballs.

Mars won't be as big as the full Moon. But it will be a nice skywatching target later this year.

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.