The incredible Mars news follows the discovery of a 430-miles-long (700km) river system. The European Space Agency (ESA) shared new pictures of the ancient, dried-up waterway. ESA’s pictures were snapped from orbit by the Mars Express Spacecraft, just south of the equator.
The ancient river system forms part of a wider network of valleys and canyons carved out by running water.
ESA’s pictures show large impact craters surrounding the branching riverbeds.
The space agency said: “Mars may seem to be an alien world, but many of its features look eerily familiar – such as this ancient, dried-up river system that stretches out for nearly 700 kilometres across the surface, making it one of the longest valley networks on the planet.
“The area of Mars shown in these new images from ESA’s Mars Express spacecraft lies just south of the planet’s equator, and is known to have been shaped by a mix of flowing water and impacts: events where rocks sped inwards from space to collide with the martian surface.”
Today, however, Mars is a barren landscape lashed by harsh solar radiation.
ESA said: “Despite the arid, hostile world we see today, Mars is thought to have once been a far warmer and wetter planet – and we see signs of this in the diverse mix of features and minerals found across its surface.
“Scientists believe that Nirgal Vallis formed in a similar way to morphologically similar valleys we see on Earth.
“As there appear to be no branching, tree-like tributaries feeding into the main valley of Nirgal Vallis, it is likely that water was replenished on ancient Mars by a mix of precipitation and overland flow from the surrounding terrain”
ESA’s photos were snapped using the Mars Express’ High Resolution Stereo Camera.