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Blue spiral galaxy with golden center

Cosmology

Using Ancient Ultraviolet Light to Probe Theories of Cosmology

By studying the formation and evolution of galaxies in the early universe, researchers seek to test the predictions of our leading theory of cosmology.

Horsehead Nebula

Space Missions

New Cosmology Probe Presents First, Stunning Images

The Horsehead Nebula and other stunning scenes highlight the talents of the just-launched Euclid mission. The telescope will reach into the depths of the cosmos to understand dark matter and dark energy.

Diagram showing lensing of quasar light by foreground galaxy and intergalactic dark matter

Cosmology

Dark Matter Clumps Float Between Galaxies, Data Shows

Astronomers have found clumps of dark matter 30,000 light-years wide in the space between galaxies in the distant universe.

Jellyfish galaxy

Galaxies

Kite-like Galaxy Trails a Million-light-year String of Gas and Star-forming Knots

A galaxy 600 million light-years away appears to be trailing gas in a string 1.2 million light-years long, but explaining its origins presents a challenge.

Three red smudges could be distant galaxies or dark stars

Cosmology

Some Astronomers Claim Dark Star Candidates in Webb Images

Three distant galaxies imaged by the James Webb Space Telescope might actually be "dark stars" powered by dark matter annihilation, claims a team of astronomers.

Galaxies

Distorted Galaxy Hints at the Nature of Dark Matter

Astronomers analyzed the gravitationally lensed image of a distant galaxy to test the nature of dark matter.

white and gold interior of LUX detector

Cosmology

Dark Matter Remains Elusive – For Now

The first run of a new dark matter experiment turns up nothing — but that still tells us something.

a glowing orb with smaller dots of lights in various colors in it and around it against a black background

Galaxies

A Cosmic Collision Could Have Made Two Dark Matter–Less Galaxies

Astronomers connect the dots between two strange doppelganger galaxies, uncovering what might be a string of galactic pearls created in a cosmic collision 8 billion years ago.

Cosmology

Twisters in the Cosmic Web

Astronomers have found that the largest structures in the universe spin, making twister-like strings of galaxies and dark matter in the cosmic web.

Dark Energy Survey

Cosmology

Dark Energy Survey Catalogs 226 Million Galaxies

The latest release from the Dark Energy Survey catalogs millions of galaxies, mapping the history of galaxy clustering across space and time.

Dark matter-less galaxy

Cosmology

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.

Cosmology

A Mysterious X-ray Signal Has Gone Missing

The absence of a mysterious X-ray signal — which could have provided evidence of dark matter — is causing as much controversy as its detection did.

Gravitational lensing

Cosmology

Hubble Sheds Light on Dark Matter and Cosmic Expansion

The Hubble Space Telescope, which will celebrate its 30th birthday this April, has images cosmic mirages that yield two remarkable cosmological results.

Artist's illustration of pulsar Geminga

Cosmology

Should We Blame Pulsars for Too Much Antimatter?

A new study suggests that pulsars are not the source of an unexpected surplus of antimatter particles detected by a space-based experiment. Dark matter remains a viable alternative explanation.

GD-1 and Palomar 5

Cosmology

Evidence for a Dark Matter Clump in the Milky Way

There are ghosts in our galaxy’s past. Now astronomers have found a way to detect them.

First Stars (art)

Cosmology

Primordial Chill Hints at Dark Matter Interactions in Early Universe

A simple experiment has detected a signal from the first stars forming just 180 million years after the Big Bang. The observations have intriguing implications for the nature of dark matter.

Sculptor dwarf galaxy

Cosmology

Stars Map Dark Matter in Dwarf Galaxy

A combo of Hubble and Gaia data reveal the distribution of dark matter in a tiny galaxy by tracking the galaxy’s stars.

The Milky Way's Gamma-ray excess

Cosmology

The Origin of the Milky Way's Mysterious Gamma Rays

Our galaxy's center region is producing gamma rays, but astronomers are still debating whether pulsars or dark matter are the source. Three recent studies tackle the debate head-on.

Galaxy rotation curves

Cosmology

Less Dark Matter in Young Galaxies?

A new study of six young, star-forming galaxies suggests they have less dark matter than expected. But the results may say more about galaxy evolution than about the nature of dark matter.

KIDS Dark Matter Map

Cosmology

Not-So-Clumpy Dark Matter Poses Cosmological Challenge

Astronomers analyzing a new sky survey have found that the distribution of dark matter in the modern universe is smoother than predicted from observations of a far younger universe.