Science Scientists studying moon's 'DNA' trace its ancestry to titanic collision

Using moon rocks gathered by Apollo astronauts, German scientists found geochemical evidence the moon was formed by a collision 4.5 billion years ago between Earth and an object called Theia.

By , Staff writer

Jeff Chiu/AP/File

When a theorized object dubbed Theia crossed paths with the early Earth 4.5 billion years ago, the encounter was brutal. Debris from the titanic collision is widely held to have formed the moon.