Mysterious space rock Four billion years ago, Jupiter, Saturn, Uranus, and Neptune battled for position within our solar system. But some scientists suspect that there was a fifth planet, similar in size to Neptune, that was also part of the battle. Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts Troubling map of Earth Showing Light Pollution Where Did Earth’s Water Really Come From? Why Did We Send A Probe To Pluto? The Secret Soviet Virus That Helps Kill Bacteria Hurricanes: Engines of Destruction German Scientists Just Tested NASA’s EM Drive… Does It Work Now?