What would happen if two neutron stars, each traveling at 90 percent the speed of light, struck each other head-on?
CHRISTOPHER PERISIE, CHELSEA, MASSACHUSETTS
Neutron stars are the smallest stars known. Although astronomers still don't know how big they are measuring the size of such small objects at astronomical distances is incredibly difficult they believe neutron stars are no more than 20 miles (32 kilometers) across. A chance collision between two stars this small is extremely unlikely in the vastness of space. It's possible only in a region of high stellar density, such as a globular cluster. Even there, you might have to wait 100 million years to see such a calamity.