8 mysterious images of Mars
Mon, Oct 11 2010 at 11:55 AM
The fourth planet from the sun, Mars is one of our closest neighbors, yet it remains a mystery. Was there once life on Mars? There is strong evidence that water once flowed on the planet, but what happened to make it disappear? Is there life still? Named for the ancient Roman god of war, the 4.6 billion-year-old planet has captured our imaginations since people first turned their eyes to the sky.