The volcano stands at 29,600 feet and stretches for 280 miles, and evidence shows it has been active for a very long time.

From arachnid-like formations and mysterious blobs to an underground ocean and a giant volcano, here are our 10 favorite things scientists discovered on Mars this year.

Pseudocraters or rootless cones are peculiar volcanic formations with an explosive origin. They do not form from magma coming ...

a doctoral student researching the geological history of Mars at the Natural History Museum in London, said in a statement. "It likely came from a really explosive volcano which launched ash high ...

NASA has released images of a vanishing "ghost island" in the Caspian Sea captured by its satellites. The Kumani Bank mud ...

What are those mysterious holes on Mars? The holes, aka pits, are located on the flanks of ancient volcanoes in Mars's Tharsis region, the largest volcanic region on the red planet and home to ...

NASA's Curiosity Rover has been exploring Mars since 2012 and more recently has found evidence of ice-free ancient ponds and ...

NASA’s Curiosity Rover has been exploring Mars since 2012 and, more recently has found evidence of ice-free ancient ponds and ...

Olympus Mons And no trip to Mars would be complete without a visit to Olympus Mons, the tallest volcano in the solar system. It covers a region the size of Arizona. It's three times as tall as ...

Fresh from the excitement of this week’s Wolf Moon, there’s another treat in store for sky-watchers this week, with Mars ...

Like Earth, Mars has polar ice caps, volcanoes, canyons and deserts. This image was stitched together from a series of photos from the Viking Orbiter — one of the communications relay stations ...