Spica is not a single star, but a binary system, meaning two stars orbit closely around one another, every four days. The stars lie approximately 11 million miles (less than 18 million kilometers ...
Binary black holes could form in merging galaxies Light variations suggest binary black holes in PG 1553+153 Gravitational waves may confirm binary black hole systems ...
We looked for light emitted from one galaxy that showed signs of harboring a binary supermassive black hole system. Galaxies like the Milky Way are nearly as old as the universe. Sometimes ...