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

Scientists say they have discovered a giant volcano hidden in plain sight on Mars. The volcano, temporarily named the Noctis, spans 280 miles wide and was discovered alongside a buried ice glacier ...

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.

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 ...

A NASA satellite has spotted frozen "kidney beans" on Mars' sand dunes trapped in place until springtime. Photographing them ...

As far as scientists can tell, Mars is no longer volcanically active. So there's no risk of these giant volcanoes erupting. But there is a possibility that residual underground lava tubes may ...

Scientists are still trying to figure out. Like Earth and Venus, Mars has mountains, valleys, and volcanoes, but the red planet’s are by far the biggest and most dramatic. Olympus Mons ...

Scientists have made a surprising discovery about Mars by playing with muck in the laboratory. An international team of researchers wondered how volcanoes that spew mud instead of molten rock ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Frozen sand dunes sit locked in place in Mars' northern hemisphere, stuck until the spring ...