1–20 of 265 results
Image showing most distant galaxy known


Webb Telescope Finds Strangely Bright Galaxies at Cosmic Dawn

Another record-breaker: Two galaxies date to only 300 million years after the Big Bang. How did they grow so big and bright so quickly?

Spiral galaxy NGC 5468


Webb Telescope Measures Universe’s Expansion

Astronomers have used the Webb telescope to observe Cepheid variable stars, ruling out one source of the prevailing "Hubble tension.”

Pandora's Cluster of galaxies


Webb Telescope Finds Dwarf Galaxies Lit Up the Early Universe

Faint, small galaxies ionized the opaque fog that obscured the early universe.

Big and Big Arc portrayed as dots on a sky map


Astronomers Find "Big Ring" 1.3 Billion Light-Years Across

Standard cosmological scenarios might not explain the breadth of a newly discovered cosmic structure.

Galaxy clusters through time


Largest-ever Catalog of X-ray Sources Tests Cosmology 

Results from a brand-new high-energy observatory are rocking the field of cosmology. In particular, a study of more than 5,000 galaxy clusters relieves tension in the standard cosmological model.

Blue spiral galaxy with golden center


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.

Supernovae discovered in the Dark Energy Survey


How Strong Is Dark Energy? Intriguing Findings from New Supernova Catalog

The largest sample of Type Ia supernovae ever made by a single telescope sheds light on dark energy.

Milky Way halo pictured as football shaped


Dark Halos and Warped Disks

Galaxies are embedded within halos of dark matter, and the tilt of those halos can affect the galaxy's stellar halo and stellar disk.

The light from a distant blue background light is distorted into a thin horseshoe encircling a luminous red galaxy at center


Astronomers Discover 562 New Candidate Strong Lenses With Machine Learning

An international research collaboration trained computers to sift through millions of images for cosmic treasure.

composite showing an ultra-diffuse galaxy in color surrounded by background shown in black and white


Ghost-like Galaxy Defies Dark Matter Model

Astronomers have discovered a large but very dim ghost-like galaxy. Its existence challenges our notions of dark matter.

The cosmic web of dark matter particles is sharp


Largest-ever Computer Simulation of the Universe

The Flamingo simulations are not only the largest but also the most all-encompassing simulations of the universe, from 13.75 billion years ago to today.


In a First, Astronomers Directly Image the Cosmic Web

Astronomers have directly imaged emission from the cosmic web, the filamentary structure that underlies the universe.

Artist's concept of giant structures made of galaxies


Galaxies Outline Bubble 1 Billion Light-Years Wide in Space

A newfound cosmic alignment of galaxies challenges fundamental ideas about the nature of our universe.

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


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.

Galaxy field with blue blob in inset


Another Early-Universe Mystery: JWST Spies Dust at Cosmic Dawn

Dust is usually the product of generations of star formation. So what is all this dust doing in the early universe, just a few hundred million years after the Big Bang?

Three red smudges could be distant galaxies or dark stars


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.

Nova Persei expansion

Explore the Night with Bob King

Time-lapse Animations Reveal a Universe in Transformation

Deep-sky objects may appear static throughout our lifetime but by carefully "blinking" archival and current images we can discern real changes in their appearance.

Captured globulars

Explore the Night with Bob King

See Summer's Best “Gobbled” Globulars

Mergers between the Milky Way and long-ago dwarf galaxies have enriched our skies with dozens of iconic globular clusters. Many are visible in small telescopes.

Field of galaxies with spiky


Webb Telescope Tracks Universe's First Light

New results from the James Webb Space Telescope find that radiation from ordinary galaxies cleared the primordial haze left over from the Big Bang, allowing the first light to shine through the early universe.

Supernova Refsdal in widefield image of galaxies


Replay of Star’s Death Sheds Light on Universe’s Expansion

A cosmic lens magnified the light of an exploding star. Now, astronomers are using observations of that supernova to calculate the universe’s current rate of expansion.

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