In fact, scientists estimate that in the coldest seasons on Mars, 150,000 tons of water, equivalent to 60 Olympic swimming pools, condense daily on the tops of these mountains.

Earth: Mt. Everest 8.848 km. Mars: Olympus Mons: 21.9 km . Showing that Mars' greatest mountain is 2.4 times the height of Earth's greatest mountain.

It’s the largest volcano on Mars, and is also the solar system’s tallest mountain. Measuring around 374 miles in diameter, it covers around the same amount of land as the state of Arizona!

A European spacecraft orbiting Mars has snapped wintry-looking pictures of a mountain range on the Red Planet's southern highlands, where ridges and crater floors are dusted with carbon dioxide ...

The Curiosity rover has been exploring Gale Crater on Mars for over three years now, decoding sand dunes , digging up ancient lakes, and now, figuring out how a mountain was built.