Removing the hydrogen-rich layers from a main sequence star exposes the helium-rich core. Such stripped helium stars are known at high and low masses,...
The oldest of these stars is 1.5 billion years old while the youngest is only 100 million years old, according to a paper published in the Astrophysical...
Astronomers have detected a mysterious and extremely bright event, named AT2022tsd, in a galaxy approximately 4.4 billion light-years away.
AT2022tsd is...
Observations of quasars reveal that many supermassive black holes were in place less than 700 million years after the Big Bang. However, the origin of...
In a new paper, astrophysicists from Australian National University present an overview of the thermal history of our Universe and the sequence of objects...
Messier 87 is a giant elliptical galaxy located some 53 million light-years away in the constellation of Virgo. In April 2019, astronomers from the Event...
The X-Ray Imaging and Spectroscopy Mission (XRISM) — a collaboration between the Japan Aerospace Exploration Agency (JAXA) and NASA, with significant...
Active galactic nuclei are primarily powered by a supermassive black hole lying at the center of a host galaxy that is accreting matter from its vicinity....
Astronomers using NASA’s Chandra X-ray Observatory, ESA’s XMM-Newton and other telescopes have found evidence for a massive stellar disruption (over...
Astronomers using the NASA/ESA / CSA James Webb Space Telescope have discovered an active supermassive black hole in CEERS 1019, a galaxy that existed...
Astrophysicists from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) Collaboration have found evidence for gravitational waves...
Unlike most gamma-ray bursts, which are caused by exploding massive stars or the chance mergers of neutron stars, a long gamma-ray burst event dubbed GRB...
The center of the Milky Way Galaxy hosts Sagittarius A*, a supermassive black hole with a mass of about 4 million solar masses that is very quiescent....
The newly-discovered black hole resides in the hyperluminous galaxy GN-z11 at a redshift of 11 and could have originated from a stellar mass seed at redshifts...
According to quantum mechanics, a vacuum state is populated by virtual particle pairs undergoing spontaneous creation and annihilation processes. These...
Astronomers discovered only relatively recently that black hole jets emit X-rays, and how the jets accelerate particles to this high-energy state is a...
Messier 4 is a globular cluster full of ancient stars in the constellation of Scorpius, approximately 7,200 light-years away.
Vitral et al. suspect that...
AT2021lwx occurred nearly 8 billion years ago and was more than 10 times brighter than any known supernova explosion. The event was likely caused by the...
Using the NASA/ESA Hubble Space Telescope, astronomers have captured a striking new photo of the densely packed globular cluster NGC 6325.
This Hubble...
