Scientists have observed two gullies on Mars that have fresh deposits, which they believe were formed by water flowing out within the past five or seven years.
› Play NowMars Reconnaissance Orbiter nears its March 10 arrival at the red planet.
› Play audioPart 2 of an interview with rover scientist Dr. Steve Squyres.
› Play audioPart 1 of an interview with rover scientist Dr. Steve Squyres.
› Play audio