Remains of an Ancient Planet near Earth?
Greeks believed that Titan gave birth to Selene, the moon goddess. Princeton researchers Belbruno and Gott hypthesise that 4.5 billion years ago, a protoplanet the size of Mars crashed into the earth, resulting in the creation of the moon. NASA is searching for it.
Where did the enormous protoplanet come from?
Belbruno and Gott believe it came from a Sun-Earth Lagrange point.
Sun-Earth Lagrange points are regions of space where the pull of the Sun and Earth combine to form a “gravitational well.” The flotsam of space tends to gather there much as water gathers at the bottom of a well on Earth. 18th-century mathematician Josef Lagrange proved that there are five such wells in the Sun-Earth system: L1, L2, L3, L4 and L5 located as shown in the diagram below.