Thankfully that is far less likely to happen now than when the solar system was very young. But it's a very good graphic and shows how our Moon would have been born when the early Earth was hit by a Mars-sized object.
what Clive's miracle hair growing formula? ![Giggle :)x](http://www.pc-pals.com/smf/Smileys/Smileys/giggle.gif)
The sheep dung is starting to take effect!
![Grin ;D](http://www.pc-pals.com/smf/Smileys/Smileys/grin.gif)