Earth may once have had a tiny second moon that was destroyed when it crashed into the other, larger moon, according to a new study.
Erik Ausphaug of UC Santa Cruz and Martin Jutzi at the University of Bern, Switzerland, say that the second moon was around 750 miles wide, and had only 4% of the primary moon’s mass.
The second moon may have sat in the Earth’s orbit at a Trojan point where the gravity of the Earth and the Moon balance out to keep objects relatively stable. (note One of the Earth’s two Trojan points is now occupied by a recently-discovered asteroid, read about it HERE)
Go read about it HERE