ONE OF MANY? The pulsar PSR J1745-2900 (left in this illustration) was discovered in 2013 orbiting roughly 150 light-years from the black hole at the center of the galaxy. That’s too far to use it to do precise tests of general relativity, but astronomers hope that the pulsar’s existence means the Event Horizon Telescope will find many more even closer to the black hole.
This illustration shows a neutron star (RX J0806.4-4123) with a disk of warm dust that produces an infrared signature as detected by Hubble. The disk wasn’t directly photographed, but one way to explain the data is by hypothesizing a disk structure that could be 18 billion miles across. The disk would be made up of material falling back onto the neutron star after the supernova explosion that created the stellar remnant.Neutron stars are among the strangest objects in the universe. Neutron sta