1–20 of 212 results
Centaurus A

Pro-Am Collaboration

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?

Tucana II

Galaxies

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.

Protocluster

Cosmology

Astronomers Spot Galaxies Clustering in Early Universe

Astronomers have discovered a cluster of galaxies coming together just 770 million years after the Big Bang.

New Horizons

Galaxies

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.

Gamma-ray burst

Galaxies

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.

Side-view of Heracles' remains

Milky Way

Astronomers Discover Galactic “Fossil” Inside the Milky Way

Thousands of stars that once belonged to an ancient galaxy are inside our own.

Galaxies

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.

Like moths in the lamplight

Galaxies

Star Clusters Reveal the "Kraken" in the Milky Way's Past

Astronomers have reconstructed the Milky Way's merger history, finding that our galaxy has absorbed five large satellite galaxies in the last 12 billion years.

ALPINE galaxies

Exoplanets

60-second Astro News: Mature Infant Galaxies & A Possibly Rogue Planet

This week in astronomy news: Distant galaxies that look older than they are and a terrestrial planet that might be drifting through our galaxy.

ALMA image of Hubble Ultra Deep Field

Cosmology

Astronomers Chart Star Formation History, Glimpse Fate of the Universe

Astronomers have tallied how star-making material evolved over cosmic time — and they've predicted how long stars will keep forming before the universe goes dark.

Dark matter: Theory vs. Observed

Galaxies

Hubble Images Reveal Dark Matter Problem

Astronomers studying Hubble Space Telescope images of massive galaxy clusters have uncovered a potential problem with dark matter.

Andromeda's halo and 43 quasars

Galaxies

Astronomers Map Andromeda’s Halo

Astronomers have observed 43 quasars in back of our sister galaxy, Andromeda, using the distant beacons to map its halo of hot gas.

Magnetic fields in Serpens South Cluster

Stellar Science

See the Invisible: A Gallery of Magnetic Fields

Magnetic fields affect everything from star formation to galaxy evolution. View a gallery of images that show magnetism's role.

Early Milky Way look-alike

Galaxies

"Dead Ringer" for the Milky Way Found in Early Universe

A cosmic magnifying glass has revealed a Milky Way-like galaxy in the early universe that doesn’t conform to cosmologists’ expectations.

Take this one for a whirl

Galaxies

Remains of an Ancient Star Cluster Revealed

A torn-apart globular cluster provides a window into the Milky Way's past.

Four sightlines through the Milky Way halo

Milky Way

The 10 Million-Degree Gas Around the Milky Way

New observations show ultra-hot gas around the Milky Way. Stellar explosions may have driven this gas out of our galaxy.

Milky Way halo

Galaxies

Galaxies Are Even Bigger Than You Think

Galaxies swim in hot gas that extends much farther out than their stars — and plays an important role in the galaxy's evolution.

Artist's concept of early disk galaxy

Galaxies

Rotating Disk in Early Universe Explains Galaxy Formation

The discovery of a stably rotating disk galaxy in the early universe is the best indicator yet for how galaxies like the Milky Way formed.

Magnetic channels in distant galaxy

Galaxies

Vast Magnetic "Strings" Puzzle Astronomers

New observations have revealed plasma strung along vast magnetic "strings" crossing hundreds of thousands of light-years.

Single-looped Knife Edge Galaxy

Galaxies

The Knife Edge Galaxy Throws Astronomers For a Loop

A 2008 image captured a stunning double loop of stars around an edge-on galaxy. Now, astronomers are questioning whether one of those loops exist.

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