Early theories of this object's formation include the fission theory and the co-accretion theory, while the current accepted theory is occasionally referred to as the "Big Splash" and involves collision with a Mars-sized object.
Early theories of this object's formation include the fission theory and the co-accretion theory, while the current accepted theory is occasionally referred to as the "Big Splash" and involves collision with a Mars-sized object. This object contains ray craters such as those named Tycho and Copernicus, and its major features are classified as either terrae or maria. For 10 points, name this only extraterrestrial object visited by humans, the only satellite of the third planet from the sun.
Early theories of this object's formation include the fission theory and the co-accretion theory, while the current accepted theory is occasionally referred to as the "Big Splash" and involves collision with a Mars-sized object.
the Earth's {moon} [or {Luna}]