Gullies on Mars Likely Not Carved by Liquid Water, NASA Says

Gullies that lace the surface of Mars appear similar to those carved out on Earth by flowing water — but a new a deep look at the Red Planet turned up no evidence that the life-giving liquid is the cause of the Martian features. The surface of Mars appears to light up in pastel shades of pink, purple, blue and green in a new image from NASA's Mars Reconnaissance Orbiter (MRO). While some scientists had theorized that the gullies form in a fashion similar to gullies on Earth — typical