3. The three most likely candidates for life in our solar system (besides Earth) are; the planet Mars, Jupiter's moon Europa and Saturn's moon Titan. This idea is based on the fact that these planets/moons may have liquid water, a molecule which is essential for life as we know it.
4. Water on Mars is found in its polar ice caps and newly carved gullies recently observed on Mars suggest that liquid water may exist on the planet's surface, and possibly in the subsurface environments (below the surface).
5. As for Europa, one of the moons of Jupiter, an ocean of liquid water likely exists beneath it's icy outer crust. The ice outer crust is approximately 2-3 km's thick and the liquid water may be as deep as 100 km's in many areas!; this water may be warmed to a liquid state by volcanic vents on the ocean floor. Jupiter also has a total of 62 moons!.
6. Saturn's largest moon, Titan, could also support extraterrestrial life. Titan has been described as having conditions similar to those of early Earth. On Titan, scientists have discovered the first liquid lakes outside of Earth, but at first they seemed to be composed of dangerous chemicals. after data was studied, it was reported on March 2008 that the oceans in Titan may in fact be composed of liquid water and ammonia. Saturn also has a total of 61 moons!.
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