65% of all stars are pairs {double star} or higher multiples. Large star typically has smaller stars circling it. Probably all stars have companion stars, black-dwarf companions, or planets. 15% of stars have black-dwarf companions. Perhaps, galaxies have 3000 x-ray-emitting double stars {x-ray star} with white-dwarf, pulsar, or black-hole companions.
Physical Sciences>Astronomy>Star>Kinds
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224