Scientists have long believed that the Moon was formed by a massive object crashing into the Earth billions of years ago and sending chunks hurtling into space that ultimately coalesced. But what was ...

The leading theory about how the moon was created is that a large object that was roughly the mass of Mars smashed into Earth billions of years ago. At the time, the Earth was obviously a lot smaller ...

One bright day on Earth about 4.5 billion years ago, everything changed. A massive object slammed into the young planet. The impact was so large that bits were flung out into space, eventually ...