According to those boffins at Brown University in Rhode Island, Mars had water flowing over the planet. It was also recent, a mere 1.25 million years ago. When you consider the universe has been around for 13.5 billion years, its not that long ago. That begs the question, did Mars have life on the planet but something went horribly wrong? The water somehow retreated back to the polar regions which we see as large white areas. For more information on what the scientists say, read it in the Geology journal. Source http://news.bbc.co.uk/1/hi/sci/tech/7919113.stm .