Once upon a time the Earth had two Moons which collided and made one, and in addition earlier this year the Catalina Sky Survey discovered a proper unknown natural Moon about the size of a compact car locked in a temporary Earth orbit.
Once upon a time the Earth had two Moons which collided and made one, and in addition earlier this year the Catalina Sky Survey discovered a proper unknown natural Moon about the size of a compact car locked in a temporary Earth orbit.