Neutron Gravita-Waltz and Dance with a Defect
Imagine two neutron stars, compressed to the size of a metropolis yet weighing one and a half Suns each. They whirl in an unrestrained gravitational dance, drawing together and flying apart every 4.4 hours. At periastron — the point of closest approach — only a couple of light-seconds separate them, and their speed reaches three and a half million kilometers per hour.