Scientists found new proofs of that the huge ocean on Mars covered the most part of
a surface of a planet billions years ago. The last answers were found in the photos made by Mars Reconnaissance Orbiter from an orbit. Images show that the delta of the ancient river flew into the huge ocean which flooded to one third of the Red planet. By the words of Mike Lamb (the associate professor of geology at the Californian institute of technology in Pasadena) the scientists assumed long ago that northern lowlands of Mars represent the dried ocean on Mars.
New research doesn’t give long-awaited absolute proofs, but confirm a hypothesis even more. The team studied pictures with high resolution of part of the northern lowlands, taken by the HiRISE chamber onboard Mars Reconnaissance Orbiter of NASA. HiRISE is capable to allocate details up 25 centimeters for surfaces of the Red planet. In particular, scientists looked narrowly at area in 39 square miles (100 square kilometers) which is part of larger area called by Aeolis Dorsa, being approximately in 620 miles (1000 km) from a crater Gale. Aeolis Dorsa has a set of the crests called by channels which are formed in river day when large objects are transferred by a current and lay down on a bottom. Channels remain on a look after the rivers which created them, dry up, helping researchers to track the past of ocean on Mars
. With HiRISE it allowed research group to make images and in the field of Aeolis Dorsa. They found out that channels are under an inclination, the same as water flows here, on
Ocean on Mars
Earth when they flow into the sea. Ancient deltas of the rivers were found on Mars earlier. But the majority of them were found in craters or others geologically limited areas, proving existence of lakes, but not the ocean. This delta differs. It, probably, one of the most convincing proofs: the delta indicates existence of a big reservoir in the northern hemisphere of Mars. It is quite possible that the delta of Aeolis Dorsa was once limited to a crater or something similar which already disappeared. However such treatment means that the surface of Mars was geologically active more long, than scientists consider. Researchers plan to continue searches of signs of existence of the ocean along its coastline, in attempt to shed more light on the warm and wet past of the Red planet.