14 DAY TRIAL // Talk about David and Goliath! In this image from the NASA Cassini orbiter, we see the enormous moon Titan to the right of the gas giant Saturn. Though it's 50 percent larger than our Moon, and 80 percent heavier, the object appears as nothing more than a tiny spec when compared to its host planet.
Titan is about 5,150 kilometers (3,200 miles) across, and is the target of so many studies primarily because it is the only body in the solar system, other than Earth, for which astronomers have solid evidence of a body of liquid on the surface.
Granted, the liquids on Titan do not contain water, but rather hydrocarbons such as methane and ethane. It is possible, many experts believe, that certain lifeforms adapted to using these chemicals may potentially endure there.
Cassini, which managed to collect this image at a resolution of 37 kilometers per pixel, has been orbiting Saturn, its rings and its moons since achieving orbital insertion around the gas giant, on July 1, 2004.