When supermassive stars reach the end of their lives and explode in a supernova, the remnants form a super-dense object called a neutron star. Pulsars are neutron stars that spin rapidly ...
The black hole, called Sagittarius A* (pronounced A-star), is an object about four million times the mass of our Sun and sits at the core of the Milky Way. Black holes are ultra-dense objects with ...