Galaxy clusters take eons to collide. Now, astronomers have caught a pair of merging clusters in an in-between stage never seen before.
New research may explain why satellite galaxies align themselves around the Milky Way
Astronomers use cosmic magnifying lenses to peer into the universe's distant past.
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.
A combination of simulations and observations indicates that galaxies like the Large Magellanic Cloud control when punier dwarfs plunge into large galaxies.
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 to two dwarf galaxies with unusually spread-out stars support the idea that these galaxies have little to no dark matter.
New applications of machine learning have enabled astronomers to classify 27 million galaxies and pick out a dozen rare quadruply lensed quasars.
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?
Astronomers have discovered a cluster of galaxies coming together just 770 million years after the Big Bang.
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.
Thousands of stars that once belonged to an ancient galaxy are inside our own.