A huge geological structure on Mars resembling a bathtub ring may be evidence of an ocean that once covered a third of the Red Planet.

Scientists found a 'bathtub ring' on Mars. Could it be evidence of an ancient Red Planet ocean?

Source: space
Source Link: https://www.space.com/astronomy/mars/scientists-found-a-bathtub-ring-on-mars-could-it-be-evidence-of-an-ancient-red-planet-ocean