Mars

NASA's Curiosity rover has captured a spectacular sight from the surface of Mars: The first-ever photo of Earth alongside the Red Planet's moon Phobos.

Newly released images of Mars reveal a "smiley" salt deposit on the Red Planet's surface. A related study suggests that similar deposits, which were left behind from ancient lakes, may be a good place to look for signs of former life on Mars.

The cause of mysterious methane spikes on Mars may be a strange form of alien life — or it may just be interesting chemistry. Either way, something odd is happening on the Red Planet.

A long-lost moon could explain why Mars is so different from the other rocky planets in the solar system.

NASA's MAVEN mission and the Hubble Space Telescope have teamed up to reveal new insights into how Mars' water is leaking into space.

As space agencies and private companies look toward sending human crews to Mars, they'll have to find ways to mitigate the dangers posed by high-energy radiation from solar storms.

Astronomers have traced the origins of 200 meteorites to five impact craters in two volcanic regions on Mars, known as Tharsis and Elysium.

NASA's Perseverance rover didn't find organic matter within the rocks, but scientists will keep looking.

Measuring wind on Mars with great sensitivity is important if we don't want accidents with vehicles, and maybe even astronauts, on the Red Planet.

"We haven't found any evidence for life on Mars, but at least we have identified a place that should, in principle, be able to sustain life."