Martian Gullies Formed by Changing Obliquity

Research suggests that Martian gullies may have been formed by the changing axial tilt of the planet over time. The obliquity, or tilt of the rotational axis, has been shown to change by 10 degrees or more over the last few million years. This tilt change could have created conditions for the melting of water ice, leading to the formation of the gullies. The presence of liquid water in the gullies is indicated by their fresh appearance, absence of impact craters on top, and observed changes over time. While the exact mechanisms behind the gully formation are still debated, this research provides new insights into the geological history of Mars and the potential for past liquid water on its surface.