Rings of Earth Formed the Moon

The Moon likely formed when a giant body collided with Earth, chomping a hungry bite out of it in a spectacular collision billions of years ago. That's the abridged bedtime story, at least. There are still many pages missing from the Moon's biography.For instance, scientists are unsure about the size and speed of the colliding object, the percentage of debris that fell to earth, flew into space or formed the moon and and how long it took the debris to condense toward a single, compact body that ...