For billions of years, Mars has remained one of Earth’s closest planetary neighbors, quietly orbiting the Sun hundreds of ...

Credit: NASA / Theophilus Britt Griswold Scientists have found a vast hidden heat imbalance inside Mars, with the southern ...

Mars may be freezing on the surface, but a new study has found unexpectedly high temperatures deep below its southern ...

Scientists were shocked when they received the first images of Martian gullies. They were even more shocked as those gullies ...

New gravity data reveal a major temperature divide deep inside Mars, with the southern interior hundreds of degrees hotter ...

Mars is by far the most Earth-like planet in the solar system… but that's not saying much. We know that Mars once hosted oceans, rivers, lakes, streams. It had a thick, carbon-dioxide-rich atmosphere.

Add Yahoo as a preferred source to see more of our stories on Google. Siccar Point, photographed by the Curiosity rover, is near Mars' Gale Crater. NASA/JPL-Caltech/MSSS; Processing & License: Kevin M ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's illustration of what a terraformed Martian landscape might look like. Mark Stevenson/Stocktrek Images via Getty Images ...

Earth-based experiments on iron-sulfur alloys thought to comprise the core of Mars reveal details about the planet’s seismic properties for the first time. This information will be compared to ...