Here's one for everyone to ponder.. Firstly, this question has always bugged me since I was born. It's not impossible to imagine an Alien civilization 1.5 billion years more advanced than us, using the method of 'Hurling Neutron Stars at 99% the speed of light, to destroy planets and their inhabitants. My question is: If a Neutron Star 20 miles wide, traveling at .99c smashes into the Earth squarely, would the Earth 1. Shatter into a million pieces? or.. 2. Nothing would happen?. Like putting a pin through a large clay ball, the Neutron Star is too small to damage Earth. Since it's traveling so fast, it would just cause a very small tunnel through the Earth, but the soil (ie Earth) and water would seal it up quickly. Please share me your thoughts on what'll happen.. or you might have some other scenarios.