The discovery of a vast, fresh impact scar on Mars began with what looked like a smudge in a routine weather snapshot. A camera built to monitor daily clouds and dust storms ended up flagging the ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission arriving in 2026 might solve the mystery.

Small lakes on ancient Mars may have remained liquid for decades, even with average air temperatures well below freezing.

At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the ...

The UA-run Phoenix Mars lander scraped the surface of our planetary neighbor to verify the presence of frozen water on Mars, and now cameras orbiting the red planet have found a meter-thick layer of ...

If humans are ever to land on Mars, they will need somewhere to stay—a protective shell that can shield them from the sun’s harsh rays. One possible answer: great, glassy domes of ice. Mars is rich in ...

This image, combining data from two instruments aboard NASA's Mars Global Surveyor, depicts an orbital view of the north polar region of Mars. The ice-rich polar cap (the quasi-circular white area at ...

New MarsDaily research explains how thin seasonal ice could have allowed ancient Martian lakes to remain liquid for decades, despite a cold early Mars climate ...