1–20 of 93 results
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.

Milky Way halo pictured as football shaped

Cosmology

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.

Giant flare on a magnetar

Stellar Science

Fast Radio Burst Roundup

They’re powerful, they’re fast, and we aren’t sure about what causes them, but astronomers are closer than ever to understanding the source of mysterious fast radio bursts.

Blue-toned comet image

Solar System

Comet 46P/Wirtanen: All Dust, No Ice

Where is all of the water around hyperactive comets coming from? A recent article asked if it could be “Ice, Ice, Maybe?” and concluded that it likely isn’t.

magnetar illustration: white sphere with magnetic dipole lines and flashes among the field lines

Stellar Science

Could Axions Help Fast Radio Bursts Escape a Magnetar’s Grasp?

New research proposes a way for fast radio bursts to escape the confines of a magnetized star and jet out into space — by getting help from theoretical particles called axions.

Fuzzy blob inset in field of galaxies

Stellar Science

Could Supermassive Stars Explain How This Galaxy Got Its Nitrogen?

Supermassive stars might explain the unusual amounts of nitrogen in one of the most distant known galaxies, GN-z11.

Disk galaxy that's brighter at its rim

Galaxies

Red Galaxies at Night, Astronomers' Delight: A Look at the “Hubble-Dark” Universe

JWST images of early galaxies have turned up a population of flat, red disks that may have been entirely missed by previous surveys.

An X-ray image of GRB 221009A

Stellar Science

Focusing on the Brightest Gamma-ray Burst of All Time

Gamma-ray bursts are the most luminous explosions in the universe, and we’ve learned much about these superlative outbursts since their discovery in 1967.

image of the three stars in the Kepler-444 system

Exoplanets

A Fresh Look at Kepler-444’s Ancient Planetary System

Astronomers have taken a closer look at a system containing three stars and five planets and may have solved a mystery around its formation.

Image of Milky Way's black hole shows golden ring with three spots in it

Black Holes

Searching for the Seeds of Supermassive Black Holes

The seeds of supermassive black holes could show up in an upcoming sky survey with JWST.

Dark planet with translucent atmosphere in front of bright star

Exoplanets

JWST Investigates an Exoplanet "Corgi"

The James Webb Space Telescope has found the tiny tail of a close-in exoplanet that's losing its atmosphere.

Star cluster with blues and reds

Stellar Science

Four Stars, Many Eclipses

Stars are most often born as multiples. Now, the TESS telescope has caught one of these multiple systems in a unique setup.

Three images show supernova in galactic outskirts brightening and then fading again

Stellar Science

A Supernova Hits a Cosmic Speed Bump

Why did a supernova abruptly change color? A recent study suggests a change in ejecta velocity — a cosmic speed bump — might be the culprit.

An astronaut from the Apollo 11 mission deploys a seismometer on the Moon.

Solar System

New Life for Lunar Seismic Data

A team of planetary scientists has reprocessed Apollo-era seismic data to meet modern forms, ensuring that these precious measurements remain usable for the next generation.

artist's illustration of sun with glint

Solar System

Caught in a Solar Storm on the Way to Mars

A chance alignment between Earth and a Mars-bound spacecraft has given us a rare glimpse at the motions of high-energy particles from the Sun.

four overlapping jupiters showing dark orange marks on the bottom

Exoplanets

When Planets Collect Comets

What kind of planets are likely to ensnare comets coming in from the icy outer reaches of a planetary system?

Centaurus A galaxy

Stellar Science

The Life and Times of Immortal Stars

Under the right conditions, stars could become immortal. How is this possible, and what does it mean for these stars’ surroundings?

Solar Orbiter images of Sun

Solar System

Spotting Dots on the Sun

You’ve heard of sunspots, but how about Sun dots? A recent solar mission has snapped photos of tiny, bright dots on the Sun, and astronomers are contemplating their cause.

FRB counterpart

Stellar Science

A Possible Optical Counterpart to a Fast Radio Burst?

What’s the mechanism behind millisecond-duration bursts of radio energy coming from outer space? A team searched for visible-light counterparts to constrain the origin of fast radio bursts — and found one.

a white planet with orange and green strip against a black background

Exoplanets

First Look at an Unusual Exoplanet’s Atmosphere

AAS Nova reports on a "super-puff" exoplanet that's nearly 15 times less dense than Jupiter.

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