(CNN)The surface of Mars is covered in intriguing features that suggest hints about the planet's past and the water that once existed on its surface.
Some mud flows like lava on Mars, study says
New research has suggested that some lava-like formations on Mars are actually the product of mud that flowed like lava — not unlike traditional volcanoes like the ones we have on Earth.
The study published Monday in the journal Nature Geoscience.
For years, Petr Brož, a researcher at the Institute of Geophysics of the Czech Academy of Sciences has been fascinated by detailed satellite images showing unique features on the Martian surface. Tens of thousands of kilometer-high steep cones are spread across Mars' northern hemisphere, and each cone bears a small crater on top.