SUNSET: 
Astronomers Find Confounding Cone Shape in Cluster Collision
Galaxy clusters take eons to collide. Now, astronomers have caught a pair of merging clusters in an in-between stage never seen before.
How Our Largest Dwarf Galaxy Keeps the Others In Line
New research may explain why satellite galaxies align themselves around the Milky Way
Nearest Supermassive Black Hole Pair Discovered
Astronomers have observed a pair of supermassive black holes set to collide in 250 million years.
60-second Astro News: Magnified Galaxies Provide Window to Early Universe
Astronomers use cosmic magnifying lenses to peer into the universe's distant past.
Watch Black Holes Grow, Galaxies Fall
Watch black holes grow and galaxies fall — astro photos and visualizations to get you through the week.
Lost & Found: Milky Way-size "Orphan Cloud"
Astronomers have found a giant gas cloud, likely stripped from its parent galaxy long ago, in a cluster 330 million light-years away.
Galaxies That Evolve Together But Don’t Stay Together
A study of 36 dwarf galaxies within a volume of space spanning 13 million light-years show they all have remarkably similar histories despite the vast distances between them.
From Starving Black Holes to Warped Galaxies
Hot topics from the American Astronomical Society summer meeting range from colliding galaxies, to warped galaxies, to starving black holes.
Astronomers Look into the Past of Local Dwarf Galaxies
A combination of simulations and observations indicates that galaxies like the Large Magellanic Cloud control when punier dwarfs plunge into large galaxies.
Not All Star-forming Clouds Are The Same
Astronomers have created the first high-resolution maps of the big, dense gas clouds that form stars within galaxies.
Astronomy in Pictures: Unraveling Galaxies and Clyde's Spot
This week in astronomy pictures: Peer into our galaxy's busy core, watch Clyde's Spot unravel at Jupiter, and see a stunning Hubble photo of a lopsided galaxy.
New Distances Support Idea of Dark Matter-less Galaxies
New distances to two dwarf galaxies with unusually spread-out stars support the idea that these galaxies have little to no dark matter.
Astronomers Use AI to Investigate Quasars and Galaxies Galore
New applications of machine learning have enabled astronomers to classify 27 million galaxies and pick out a dozen rare quadruply lensed quasars.
Amateur Astronomers Reveal Long-Ago Galaxy Mergers
The images from five Brazilian amateur astronomers have captured Hubble-level details in galaxies, laying the ground for future work in understanding their histories. Want to join the fun?
Our Tiny Galactic Neighbor Hosts Ancient Stars
New observations show ancient stars lining the edges of the ultra-faint dwarf galaxy Tucana II, a tiny satellite of the Milky Way.
Astronomers Spot Galaxies Clustering in Early Universe
Astronomers have discovered a cluster of galaxies coming together just 770 million years after the Big Bang.
What New Horizons Found in Deep Space — And Why It Matters
NASA’s mission to the outer solar system has found more light than expected. That could mean more galaxies in the visible universe than we thought— or less, depending on who you talk to.
Astronomers Find Most Distant Gamma-ray Burst Yet
From the farthest-known galaxy in the observable universe comes the brightest and most energetic of events: a possible gamma-ray burst.
Astronomers Discover Galactic “Fossil” Inside the Milky Way
Thousands of stars that once belonged to an ancient galaxy are inside our own.
A Dark Matter-less Galaxy, Explained (Maybe)
An international team of astronomers has explained the lack of dark matter in a distant dwarf galaxy — another galaxy stole it.
