The above image shows a 20-meter-long chunk of frozen carbon dioxide falling off a cliff. Rising temperatures during the ...

A Mars image shows a strange square formation. Some think it's artificial, but experts suggest natural causes.

The rover's 26th sample, known as "Silver Mountain," has textures "unlike anything we've seen before," NASA says.

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Formations that look like jumbo-sized kidney beans (or blobs of chocolate syrup, depending on your palette) may be indicators ...

For years, scientists have been puzzled about why Earth and Mars have fewer important elements like copper and zinc compared ...

Mars has northern and southern hemispheres like Earth, but their defining characteristics are markedly different, a phenomenon known as Martian dichotomy. The Southern Highlands are older ...

Engineers must calculate the ideal orbits for sending a spacecraft from Earth to Mars. Like throwing a dart at a moving target from a moving vehicle, they must calculate where the planet will be ...