SUNSET: 
Andromeda Collided with Galactic Sibling Billions of Years Ago
A new study says our neighbor galaxy’s big stellar halo and stellar evolution are due to a major collision that ended 2 billion years ago.
Disentangling the History of the Magellanic Clouds
The Magellanic Clouds — two nearby dwarf galaxies easily visible to the naked eye in the southern hemisphere — are key to understanding the dynamics and evolution of the Local Group of galaxies. Can an in-depth look at these galaxies’ outer regions help us make sense of their complicated interaction history?
Do Big Black Holes Wander the Galaxy?
New simulation work suggests that galaxies like the Milky Way could be home to a dozen supermassive black holes.
14 Galaxies Might Become Universe’s Most Massive Structure
At least 14 galaxies are swarming in the early universe, forming a protocluster with the mass of 10 trillion Suns. It might become one of the most massive structures in the universe.
Globular Clusters Shine in a Galaxy Lacking Dark Matter
You may have seen recent news about NGC 1052–DF2, a galaxy that was discovered to have little or no dark matter. Now, a new study explores what NGC 1052–DF2 does have: an enigmatic population of unusually large and luminous globular clusters.
A Galaxy Without (Much) Dark Matter
Astronomers have found a peculiar object: a fluffy galaxy that has little to no dark matter.
Hubble’s View of Little Blue Dots
The recent discovery of a new type of tiny, star-forming galaxy is the latest in a zoo of detections shedding light on our early universe. What can we learn from the unique “little blue dots” found in archival Hubble data?
Orderly Dwarf Galaxies Challenge Cosmological Wisdom
Most of the dwarf galaxies around Centaurus A appear to be orbiting the giant galaxy along a single plane — a result not predicted by current cosmological models.
Galaxies Show Order in Chaotic Young Universe
New observations of galaxies in a universe just 800 million years old show that they’ve already settled into rotating disks. They must have evolved quickly to display such surprising maturity.
Stars Map Dark Matter in Dwarf Galaxy
A combo of Hubble and Gaia data reveal the distribution of dark matter in a tiny galaxy by tracking the galaxy’s stars.
The Black Hole Files with Camille Carlisle
Most Distant Black Hole Yet
Astronomers have discovered a supermassive black hole scarfing down gas just 690 million years after the Big Bang.
New Telescope Sees Galaxy Down to Its Atoms
Astronomers have obtained the most detailed radio image of hydrogen gas in a neighboring galaxy, revealing its structures with more precision than ever before.
A Deeper View of Hubble’s Ultra Deep Field
The iconic image of faraway galaxies, and one of the most-observed regions of space, has just received a spectroscopic upgrade.
Putting the Brakes on the Stellar Baby Boom
Two studies of distant galaxy clusters point to different mechanisms of stopping the baby boom that reigned in the early universe.
Globular Clusters for Faint Galaxies
The origin of ultra-diffuse galaxies (UDGs) has posed a long-standing mystery for astronomers. New observations of several of these faint giants with the Hubble Space Telescope are now lending support to one theory.
Milky Way May Be Made with Swapped Gas
High-powered simulations suggest that half of the material in the Milky Way could come from other galaxies.
Incredible Resolution: Reconstructed Galaxy Pushes Hubble’s Limits
Thanks to the effects of gravitational lensing, a team of astronomers was able to reconstruct a distant galaxy and study its unexpectedly clumpy star forming regions.
Ring Found Around a Galaxy’s “Hidden” Black Hole
A team of astronomers has taken a close look at a nearby galaxy — and discovered an unusual structure that sheds light on supermassive black holes’ relationships with their host galaxies.
Homing in on the Source of a Mysterious Fast Radio Burst
Ground- and space-based observations have now shed intriguing new light on a mysterious radio source more than 3 billion light-years away.
Astronomers Discover Magnetic Bridge Between Magellanic Clouds
A magnetic field appears to span the space between the Large and Small Magellanic Clouds, the two dwarf galaxies being consumed by our Milky Way Galaxy.
