The apparent discovery of water on Mars is important for a couple of reasons. University of Missouri astronomist Jack Burns says it makes the discovery of primitive life more likely. Humans theoretically originated in water and its believed water is needed to support life. Dr. Burns says its also important if humans are ever to visit the Red Planet. Water would be necessary for drinking, growing plants, and making rocket fuel for the return trip. He estimates 30 or 40 years for that to happen. He describes it as a 2 year mission, with 6 months to get there, 1 year on the planet, and another 6 months back.