The HiRise camera is living up to its name, capturing a rare look at the veteran rover from way up in Martian orbit.

New research suggests ancient Mars may have been warm and wet, with rainfall or snowmelt carving its iconic valleys.

A reddish star is about to pass through a "beehive" of stars. That "star" is actually one of Earth's planetary neighbors.

Perhaps the best known of all comets is Halley, correctly pronounced so that it rhymes with rally, not daily. It is named after the 17th-18th century astronomer Edmond Halley. This ...

Mars is about 140 million miles from our cozy planet. A human mission to that cold, rocky neighbor would mean being away from Earth for about 3 years. But the things those explorers would see and ...

A new study has revealed that lichens can withstand the intense ionizing radiation that hits Mars' surface. (The lichen in this photo is Cetraria aculeata.). | Credit: Pensoft Earth-based ...

One billionaire wants to move industry off-world, returning Earth to a pristine state. The other wants to colonise Mars.

Satellite data show valley networks on Mars similar to Earth's, especially places like Utah, suggesting formation through flowing water—not just melting ice. Researchers simulated both melting ice ...

"Before Hubble, no generation ever had access to unimaginably vibrant views of space, stretching almost all the way back to ...

"You could pull up Google Earth images of places like Utah, zoom out, and you'd see the similarities to Mars," said Steckel, now at the California Institute of Technology. Most scientists today ...