The ripples suggest that the lake was free of ice at one point.

A mosaic image of Mars created by compiling images captured by the Viking Orbiter 1. A mosaic image of Mars created by compiling images captured by the Viking Orbiter 1. NASA/USGS Using InSight's ...

A recently discovered square structure on Mars has sparked debates between natural geological processes and the possibility ...

A supposed square structure spotted on Mars sparked speculation about alien archeological sites on the red planet. It's a fun ...

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 ...

In something straight out of an episode of Doctor Who, a Mars orbiter has spotted what appears to be a swarm of spiders ...

The strange formation was spotted in a region of the Red Planet known as Cydonia. Cydonia is close to where scientists ...

The Mars Express orbiter launched to the Red Planet. Twenty years later, ESA has delivered a high resolution color image of Mars along with a time-lapse of "webcam" images that were released in near ...

NASA's Mars Reconnaissance Orbiter has captured images of kidney bean-shaped frozen sand dunes in Mars' northern hemisphere, revealing layers of carbon dioxide frost. These formations provide ...

The surface in Mars' northern and southern hemisphere ... known about the divide since the 1970s when NASA's Viking orbiter returned images of the Red Planet's unusual surface.