Astronomical black holes are compact astrophysical systems characterized by regions of spacetime where gravity is so strong that no matter or radiation can escape beyond the event horizon. They are described by solutions to Einstein’s field equations, typically approximated by the Kerr or Schwarzschild metrics, and are defined by mass, spin, and (negligible) charge. Formed primarily via stellar core collapse or hierarchical mergers, they interact with their environments through accretion disks, relativistic jets, and gravitational-wave emission. Astronomical black holes span stellar-mass to supermassive regimes, influencing galactic dynamics, high-energy radiation processes, and cosmological structure formation.
Very massive stars (VMSs), which typically have masses about 100 times that of our own sun, are critical components in our understanding of the formation of important astronomical structures like black holes and supernovae. ...
Astronomy
Jun 17, 2025
0
55
Binary neutron star mergers, cosmic collisions between two very dense stellar remnants made up predominantly of neutrons, have been the topic of numerous astrophysics studies due to their fascinating underlying physics and ...
The monster black hole lurking at the center of galaxy M87 is an absolute beast. It is one of the largest in our vicinity and was the ideal first target for the Event Horizon Telescope. Scientists have taken a fresh look ...
Astronomy
Jun 10, 2025
0
89
A black hole has blasted out a surprisingly powerful jet in the distant universe, according to a new study from NASA's Chandra X-ray Observatory. This jet exists early enough in the cosmos that it is being illuminated by ...
Astronomy
Jun 10, 2025
0
111
A team of astronomers led by Michael Janssen (Radboud University, The Netherlands) has trained a neural network with millions of synthetic black hole data sets. Based on the network and data from the Event Horizon Telescope, ...
Astronomy
Jun 6, 2025
1
2654
Astronomers from the University of Hawaiʻi's Institute for Astronomy (IfA) have discovered the most energetic cosmic explosions yet discovered, naming the new class of events "extreme nuclear transients" (ENTs). These extraordinary ...
Astronomy
Jun 4, 2025
1
270
The Big Bang is often described as the explosive birth of the universe—a singular moment when space, time and matter sprang into existence. But what if this was not the beginning at all? What if our universe emerged from ...
Astronomy
Jun 4, 2025
133
574
Across the cosmos, many stars can be found in pairs, gracefully circling one another. Yet one of the most dramatic pairings occurs between two orbiting black holes, formed after their massive progenitor stars exploded in ...
Astronomy
Jun 3, 2025
0
101
Quasars are some of the brightest objects in the universe. A quasar is powered by large amounts of matter falling into the supermassive black hole at the center of a galaxy. Collisions and mergers between galaxies can cause ...
Astronomy
Jun 3, 2025
1
64
In the world of black holes, there are generally three size categories: stellar-mass black holes (about five to 50 times the mass of the sun), supermassive black holes (millions to billions of times the mass of the sun), ...
Astronomy
May 30, 2025
0
289
