Enceladus used to be just another icy moon until the Cassini spacecraft spotted geysers on its surface, spewing water 125 miles into the sky back in 2005. Now, after years of research, scientists have published two studies suggesting that these geysers are caused by hydrothermal vents or fissures that heat the water at the bottom of the 6-mile-deep ocean beneath the Saturn's moon ice crust. Why is that important? Well, if the vents truly exist, the waters that surround them will contain chemicals and minerals necessary for life. Plus, the conditions around those vents will be similar to the environment surrounding Atlantic Ocean's hydrothermal field -- the place where life on Earth might have begun.