The atmosphere of Titan is composed of hydrogen and methane among other constituent gases. It has an atmospheric pressure comparable to Mars and is known to house many organic molecules. Titan attracts an unusual amount of attention because of the alleged presence of hydrocarbons on its surface. These hydrocarbons would produce a brownish substance similar to that made during experiments on the origin of life. Thus, Titan is probably the satellite most likely to support life of any kind.
Asteroids exist between the orbits of Mars and Jupiter.
They are irregularly shaped terrestrial bodies because of the abundance of metal and rock. Collisions between asteroids are infrequent but can produce meteors. Some theories concerning the origin of the asteroid belt state that the asteroids could be the remains of a planet ripped apart by the tidal forces of Jupiter and Mars. Tidal forces rely on gravity. Under the presence of sufficient gravity, bodies of matter experience shifting of various parts of the body, usually the outer layer.