When galaxies collide, it's not a gentle affair, but it does take millions of years. Over this time, the two massive star ...

See amazing views of colliding galaxies NGC 520 and barred galaxy IC 4212 in imagery from the Siena Galaxy Atlas. Credit: ...

ORCs are vast, faint rings of radio energy that surround galaxies and can be detected only in radio wavelengths of the electromagnetic spectrum. They are made up of fast-moving, magnetized plasma.

A 50-million-light-year-long flow of hydrogen gas has been observed linking two tiny galaxies 50 million light-years away, ...

In a groundbreaking study, astronomers led by Natsuki H. Hayatsu have serendipitously uncovered an ultra-luminous infrared ...

A swarm of galaxies called the Bullet Cluster is the biggest, best natural laboratory for studying dark matter that astronomers have ever seen ...

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A vast river of neutral hydrogen bridges two galaxies that are beginning to enter the monstrous Virgo Cluster, and this structure is helping astronomers better understand our Milky Way's relationship ...

Astronomers from the University of Hawaii’s Institute for Astronomy have identified a new category of events that they found to be much more powerful than gamma-ray bursts, called extreme nuclear ...