1–20 of 202 results
Dark matter: Theory vs. Observed

Cosmology

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

Milky Way

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.

Massive, dusty, star-forming galaxy

Galaxies

What Snuffed Out Star Formation in This “Monster” Galaxy?

Astronomers have discovered a galaxy that formed five times as many stars as the Milky Way within 2 billion years after the Big Bang — but then quickly quelled any further starbirth.

Dwarf Galaxy

Black Holes

More Big Black Holes Found in Small Galaxies

In the quest to discover how massive black holes form, astronomers have spotted several of these objects in some of the smallest galaxies yet found to host them.

Hydrogen halo around young galaxy

Galaxies

How Young Galaxies Grow

A pair of recent studies sheds light on some of the universe’s earliest galaxies and how they grow.

NGC 6240 and its three black holes

Galaxies

Three Black Holes May Merge in Nearby Galaxy

New observations of a galactic crash site show that there are not just two but three supermassive black holes on the verge of union. Two of them are only 650 light-years apart, the closest pair known.

Fast radio burst as probe of a galaxy halo

Galaxies

Exotic Messenger Probes a Galaxy’s Outer Reaches

Astronomers made use of a fast radio burst, a 40-microsecond flash at radio wavelengths, to evaluate the state of the nearly undetectable gas around an intervening galaxy.

Galaxies

"Invisible" Galaxies Found in the Young Universe

Astronomers have discovered galaxies that have escaped detection until now, uncovering a missing link in galaxy evolution.

Galaxies

Peer Deep Within the Large Magellanic Cloud

A team of amateurs reveals the Large Magellanic Cloud, a galactic neighbor, in an exceedingly deep, high-resolution mosaic.

Galaxies

Why Are Two Ghost Galaxies Missing Dark Matter?

Ultra-diffuse galaxies are usually dark matter-rich. But astronomers have discovered two of these galaxies that lack dark matter altogether.

Cigar Galaxy's Galactic Superwind

Galaxies

Tracing the Cigar Galaxy's Superwind

NASA’s SOFIA airborne observatory has returned a striking far-infrared view of the Cigar Galaxy and its “galactic superwind.”

Galaxy cluster Abell 1314

Galaxies

Radio Survey Maps Hundreds of Thousands of New Galaxies

The LOFAR survey, based in The Netherlands, has released a bonanza of new sources. And with only 2% of the sky covered so far, this is only the beginning.

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