MARS HiRise Image: Ancient Mars River May Have Flowed into Huge Ocean

Left: A shaded relief map shows channelized sedimentary deposits interpreted as an ancient river delta in Aeolis Dorsa, Mars. Right: A modern delta on Earth.

Credit: DiBiase et al. /Journal of Geophysical Research/2013 and USGS /NASA Landsat

Scienitsts have spotted more evidence that an enormous ocean on Mars covered much of the planet's surface billions of years ago.

The latest clues were found in photos from NASA's powerful Mars Reconnaissance Orbiter (MRO) in orbit around the planet.

The images show what appears to be an ancient river delta, which may have emptied into a vast Martian ocean that inundated up to one-third of the Red Planet long ago, a new study reports.

"Scientists have long hypothesized that the northern lowlands of Mars are a dried-up ocean bottom, but no one yet has found the smoking gun," study co-author Mike Lamb, an assistant professor of geology at the California Institute of Technology (Caltech) in Pasadena, said in a statement.



The new study does not provide the long-sought smoking gun, researchers stressed, but it further bolsters the hypothesis.

The team studied high-resolution images of a slice of the northern lowlands snapped by the HiRise camera aboard NASA's Mars Reconnaissance Orbiter, which can distinguish features as small as 10 inches (25 centimeters) on the Red Planet's surface.

Specifically, the scientists looked at a 39-square-mile (100 square kilometers) area that's part of a larger region called Aeolis Dorsa, which lies about 620 miles (1,000 km) from Gale Crater.

NB: NASA's Curiosity rover touched down inside Gale Crater last August, kicking off a planned two-year surface mission to assess Mars' past and present potential to host microbial life.

Overview map showing the location of an ancient river delta (star) within Mars' Aeolis Dorsa region, which is found along the boundary between the Red Planet's cratered southern highlands and smooth northern lowlands.

Credit: DiBiase et al./Journal of Geophysical Research/2013 

The small section of Aeolis Dorsa features many ridges called inverted channels, which form in river bottoms over time when coarse material, such as gravel, is deposited by flowing water.

Inverted channels can linger long after the rivers that created them have evaporated,helping researchers trace the past activity of liquid water on Mars.

HiRise images allowed the study team to do just that in the section of Aeolis Dorsa they examined.

They found that the inverted channels spread out markedly and slope steeply downward near their end, just as streams here on Earth do when they approach and empty into the sea.

Ancient river deltas have been discovered on Mars before. But most of them have been spotted inside craters or other geologically bounded regions, providing evidence for lakes but not global oceans, researchers said.

The newly-found delta is different. "This is probably one of the most convincing pieces of evidence of a delta in an unconfined region — and a delta points to the existence of a large body of water in the northern hemisphere of Mars," lead author Roman DiBiase, a postdoctoral scholar at Caltech, said in a statement.

Just how big this body of water was remains an open question. It would at least have flooded all of Aeolis Dorsa, covering about 38,600 square miles (100,000 square km), researchers said. And it might even be the long-hypothesized global ocean, which some scientists suspect covered a third of Mars.