A NASA spacecraft that has been circling Mars for more than two decades has spotted something it never has before in well over 100,000 orbits of the Red Planet. On a morning horizon in May, the ...

Scientists are examining a mysterious giant scar stretching across Mars — and do not know how it got there. The incredible feature, longer than the 446km (227-mile) Grand Canyon at roughly 600km (373 ...

A weird long cloud has formed so many times over the same Martian volcano that scientists have given up and named it. Meet the Arsia Mons Elongated Cloud, or AMEC. Its long bright trail has become a ...

NASA's Mars Odyssey spacecraft has captured a breathtaking image. The image shows Arsia Mons, a massive Martian volcano. The volcano is seen piercing through morning haze. Arsia Mons is twice the ...

What's that 'curious cloud formation'? A photograph from a spacecraft orbiting Mars shows a long, white wisp, close to a thousand miles long, spilling out of a giant volcano. Could the volcano, ...

Around the same time that the dinosaurs became extinct on Earth, a volcano on Mars went dormant, NASA researchers have learned. Arsia Mons is the southernmost volcano in a group of three massive ...

Arsia Mons produced one new lava flow at its summit every 1 to 3 million years during the final peak of activity, about 50 million years ago. The last volcanic activity there ceased about 50 million ...

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If life existed on Mars in the recent past, the best spot for it could have been on a giant volcano once encrusted with a glacier, according to a team of Brown University scientists using data from ...