One theory of this entity's creation states that a Mars-sized body named Theia ("THEE-uh") collided with its parent planet. This object exhibits synchronous ("SIN-kro-nuss") rotation with its parent planet, and that rotation 
One theory of this entity's creation states that a Mars-sized body named Theia ("THEE-uh") collided with its parent planet. This object exhibits synchronous ("SIN-kro-nuss") rotation with its parent planet, and that rotation results in the namesake "dark side" of this object. The Sea of Tranquility lies on, for 10 points, what astronomical body responsible for the Earth's tides, its largest natural satellite?
One theory of this entity's creation states that a Mars-sized body named Theia ("THEE-uh") collided with its parent planet.
Moon