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.

"Rootless cones form when lava flows over wet or icy ground, causing it to boil and explode," said Dundas. "The region around ...

Rootless cones are small volcanic landforms ranging from several to several hundred meters in diameter, formed by continuous ...

The findings, recently published in the journal Nature, suggest that the volcanoes on the moon Io are fed by individual magma chambers rather than a single giant mass of magma. Io is home to ...

but of Mars as well. The model proposed by Montgomery and colleagues 6 helps to link some of the key features in this region. More conclusive evidence for the feasibility of a giant landslide is ...

Mars has northern and southern hemispheres like Earth, but their defining characteristics are markedly different, a ...