Name the Spacecraft, which is used by NASA to find "Ligeia Mare", the second largest known body of liquid on Saturn's moon Titan.

NASA's (National Aeronautics and Space Administration) Cassini spacecraft has made an incredible observation about the extraordinary deep lakes filled with methane in the Saturn's moon, Titan. This new study has been published in the scientific journal Astronomy.Titan, Saturn's largest moon has methane rain that can fill lakes as much as 330 feet deep.Titan has become only planetary body known to have stable liquid on its surface, apart from Earth.