Three merging galaxies host three active black holes, offering rare insight into galaxy and black hole growth.
This low-cost mission is still only getting started, and it's taking bigger risks than typical big-ticket NASA missions.
Astronomers have traced the origin of a colossal white dwarf to a catastrophic crash between two dead stars, turning a quiet ...
Three galaxies are colliding, and all of them are hiding something powerful at their core. This isn’t just rare. It’s unheard ...