A Nasa spacecraft that has been in orbit around Mars has revealed fan-shaped gullies on the surface, which are estimated as being about 1.25 million years old.
Scientists from Brown University in Rhode Island, America, think the channels were created by water from melting ice and they say this would be evidence that water flowed on the planet's surface more recently than was previously thought.
Samuel Schon and colleagues from Brown University have been examining the impact of craters on a gully system in Promethei Terra, which is part of the Martian highlands south of the planet's equator.
The science team also say that the images suggest that Mars experienced a recent ice age in which polar ice was likely to have been carried toward the equator.
