Galaxy
A galaxy is any of the systems of stars and interstellar matter that make up the universe. A galaxy is composed of stars, stellar remnants, interstellar gas, dust, and dark matter that are all held together by gravity.
Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants.
The first high-resolution map of a massive explosion
A gas outflow so large that it would take 20,000 years for light to travel from one side to the other.
Astronomers Discover Most Massive Stellar Black Hole in Our Galaxy
A discovery by astronomers from the European Space Agency’s Gaia mission has revealed the most massive stellar black hole ever found in the Milky...
Astrophysicists traced the violent journeys of stars orbiting our galaxy’s central black hole
Stellar collisions produce strange, zombie-like survivors.
Universe’s Expansion History: Insights from the DESI Survey
The DESI survey has observed a new set of 5000 galaxies every 20 minutes since its launch in 2021.
NASA’s James Webb Telescope Probes Starburst Galaxy Messier 82
Amid a galaxy teeming with new and young stars lies an intricate substructure.
A large black hole that “hiccups,” giving off plumes of gas
Persistent “hiccups” in a far-off galaxy draw astronomers to new black hole behavior.
Strong magnetic fields spiraling at the edge of the Milky Way’s central black hole
Strong magnetic fields may be common to all black holes
An obscure class of galaxies briefly awakens sleeping supermassive black holes
Radio observations of Compact Symmetric Objects (CSOs) provide new clues about their origins.
Blue supergiant stars can be formed by the merger of two stars
Strong evidence that most blue supergiants may have formed from the merger of two stars.
Largest-ever map of the universe’s active supermassive black holes
New “quasar catalog” serves as a 3D history book of the universe.