Robert Roy Britt

Large valleys spotted in new images from the Mars Reconnaissance Orbiter.

However, big Earth-threatening solar storms could still kick up at any time, the researchers cautioned today.

The Great Red Spot, a colossal storm twice the diameter of our planet, has been raging for at least 300 years.

A recently discovered comet is making its closest approach to Earth in the next few days.

If skies are clear Saturday, go out at sunset and look for the giant moon rising in the east.

A new study outlines grim possibilities on Earth for a worst-case scenario solar storm.

A delightful display of planets and the moon will occur on New Year's Eve.

Friday's full moon will be the biggest of the year, the closest to us.

Carbon dioxide, a potential fingerprint of life, has been discovered for the first time in the atmosphere of a planet orbiting another star.

Venus and the moon will deliver a Halloween treat visible this evening just as little ghosts and goblins head out to gather candy.

Around a distant star, two planets similar to Earth collided and were destroyed.

Eight-legged animals survived exposure to the harsh environment of space, supporting the idea that simple life forms could travel between planets.

A spectacular nearby star explosion observed in 1843 is now thought to be related to a class of distant supernova imposters that seem to explode periodically yet remain intact.

The annual Perseid meteor shower peaks in the pre-dawn hours.

A total solar eclipse Aug. 1 will fascinate those who can see it.

A small asteroid sailing past our planet right now turns out to be two giant rocks orbiting each other.

Earth emits an ear-piercing series of chirps and whistles.

Regardless of where black holes dine, they have the same culinary habits, research found.

As the full moon rises this Wednesday evening, June 18, many people will be tricked into thinking it's unusually large.

Disgruntled scientists renewed their vows this week to call Pluto a planet despite an international governing body's latest ruling to reclassify the tiny world.

The IAU decides on a name for Pluto and other round objects way out there.

Physicists announced today a way to explain how information could escape from a black hole.

New sunspot groups appeared this week, and are all growing rapidly.

Wednesday night is the last chance to view a total lunar eclipse before 2010.

A Jupiter-like planet and another about the size of Saturn.