It has been said that there were a lot of things that occurred in our solar system back when the world was still underdeveloped. The earth was able to survive but there was a time when it was hit by another large debris. A lot of masses were formed and it eventually formed the moon that we have right now.
Some say that the same fate could have been experienced by Venus. However, the spin of Venus is different from the other planets. It also does a very slow rotation. It may have caused its own moon to break down and just collide with Venus. This may have contributed to the type of planet that venus is at present time.