The Red Planet once had a wet climate and rain

US scientists on November 23 announced a new map of Mars showing that there was a large ocean in the north and valleys lying around the planet's equator.

Winding road to the west of Ladon Valles on Mars.(Photo: guardian.co.uk)

This is evidence that Mars has a wet climate and rain.

Previously, the lack of a river network on the surface of Mars has strengthened the hypothesis that rain is not possible on this planet.

However, the new map is based on data provided by satellites of the US Aeronautics Agency (NASA) showing that the valley network on the Martian surface is at least two times larger than the assessment. before.

Duy Lac geography professor at Northern Illinois University, the author of the work, said an ocean in the Northern Hemisphere is the solution to the phenomenon of southern Mars less valleys.

This led to the hypothesis that the low rainfall in the South could not form valleys, and explained the phenomenon of valleys growing gradually as it traveled from North to South.

The above work is published in the Journal of Geophysical Research.