Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane, the main component of natural gas, and probably the most abundant organic compound on earth. The relative abundance of methane makes it an attractive fuel. However, because it is a gas at normal conditions, methane is difficult to transport from its source . Methane is a tetrahedral molecule with four equivalent C-H bonds.

This image was taken on July 23, 2012 and received on Earth July 23, 2012. The camera was pointing toward SATURN-RINGS at approximately 148,195 miles (238,496 kilometers) away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2013. Image Credit: NASA/JPL/Space Science Institute

This image was taken on July 22, 2012 and received on Earth July 23, 2012. The camera was pointing toward SATURN-RINGS at approximately 106,932 miles (172,091 kilometers) away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2013. Image Credit: NASA/JPL/Space Science Institute

This image was taken on July 18, 2012 and received on Earth July 20, 2012. The camera was pointing toward TITAN at approximately 1,884,659 miles (3,033,065 kilometers) away, and the image was taken using the CL1 and CB3 filters. This image has not been validated or calibrated. A validated/calibrated image will be archived with the NASA Planetary Data System in 2013. Image Credit: NASA/JPL/Space Science Institute

These two NASA maps of Titan show the ground track of the Cassini spacecraft over Titan during the July 24, 2012, flyby to search for light glinting off the methane lake Kivus Lacus. NASA/JPL-Caltech

During the July 24, 2012, close Titan flyby, called T-85, the Cassini spacecraft searched for a glint of sunlight reflecting off a methane lake. NASA/JPL-Caltech