<P> Titan is the sixth ellipsoidal moon from Saturn . Frequently described as a planet - like moon , Titan is 50 % larger than Earth 's Moon , and it is 80 % more massive . It is the second - largest moon in the Solar System , after Jupiter 's moon Ganymede , and is larger than the smallest planet , Mercury , but only 40 % as massive . Discovered in 1655 by the Dutch astronomer Christiaan Huygens , Titan was the first known moon of Saturn , and the sixth known planetary satellite ( after Earth 's Moon and the four Galilean moons of Jupiter ) . Titan orbits Saturn at 20 Saturn radii . From Titan 's surface , Saturn subtends an arc of 5.09 degrees and would appear 11.4 times larger in the sky than the Moon from Earth . </P>
<P> Titan is the sixth ellipsoidal moon from Saturn . Frequently described as a planet - like moon , Titan is 50 % larger than Earth 's Moon , and it is 80 % more massive . It is the second - largest moon in the Solar System , after Jupiter 's moon Ganymede , and is larger than the smallest planet , Mercury , but only 40 % as massive . Discovered in 1655 by the Dutch astronomer Christiaan Huygens , Titan was the first known moon of Saturn , and the sixth known planetary satellite ( after Earth 's Moon and the four Galilean moons of Jupiter ) . Titan orbits Saturn at 20 Saturn radii . From Titan 's surface , Saturn subtends an arc of 5.09 degrees and would appear 11.4 times larger in the sky than the Moon from Earth . </P>
titan is the natural satellite of which planet
titan is the natural satellite of which planet
Saturn
Saturn