For 10 points, name this only natural satellite of Earth.
The low density of this body is not explained by the Condensation Theory of its formation. This body's small magnetic field may have been generated by collisions, such as the one that created its Sea of Showers impact basin. The Ranger 8 crashed into its (*) Sea of Tranquility. The gravity of this body is too weak to hold an atmosphere but large enough to cause ocean tides on Earth. For 10 points, name this only natural satellite of Earth.
The low density of this body is not explained by the Condensation Theory of its formation.
Earth's moon (accept Luna)