Scientists have found out that traces of ripples have been found on the planet Mars, which prove that there were ice-free reservoirs on the "Red Planet" in ancient times. The ripple marks date back to 3.7 billion years ago, when the Martian climate was dense and warm enough for liquid water to exist on the surface. This is reported by the journal Science Advances.
The traces of such waves could have appeared in shallow water reservoirs up to two meters deep, under the influence of wind and water, the scientists note. Ripple marks were found in two different rock layers, which proves that they were formed at different times. There is an accepted opinion in science that the climate of Mars was drier and colder, but recent discoveries, which prove that there was liquid water on the surface of Mars, indicate that the climate of Mars was actually denser and warmer.
