21–40 of 88 results
Bullet Cluster


Does a Fifth Force Permeate the Universe?

A team of theoretical physicists thinks a fifth force could explain an anomaly spotted in a nuclear physics experiment. If true, it could have huge ramifications for particle physics and dark matter — but that’s a pretty big if.

two black holes in the moments before a catastrophic collision

Black Holes

LIGO Detects Second Black Hole Collision

The gravitational wave observatory has detected a second event, heralding a new era in astrophysics. The day after Christmas last year, the cosmos quietly gifted scientists with gravitational waves — ripples in the fabric of spacetime – produced in a collision between two stellar-mass black holes. It’s the second event…

Supernovae Simulations Carve Local Bubble

Stellar Science

Long-Ago Supernovae Littered Earth

Roughly 2 million years ago, as the human ancestor homo erectus was descending from the trees, two supernovae exploded nearby and showered Earth with debris.

The Crab Nebula

Stellar Science

Mysterious Radio Burst Repeats Itself

A brief burst of radio waves has been observed repeating, enabling astronomers to settle its exotic origin.

Australia's Compact Array

Stellar Science

Astronomers Pinpoint Mysterious Radio Burst

A radio burst with the energy of a hundred million Suns has finally been placed on the cosmic map, enabling scientists to investigate the origin of these mysterious bursts.

A Gravitationally Unstable Circumstellar Disk (Model)

Stellar Science

Stars Form in Turbulent Times

New images of four circumstellar disks suggest that the star formation process is much more violent than previously thought.

Ripples in the Milky Way's Disk


A Galaxy Hit-and-Run

Ripples found in the Milky Way’s disk reveal our galaxy survived an ancient hit-and-run. Now, astronomers might have caught the culprit.

An artist's impression of a damped-lyman alpha system


Seeing Shadows of Ancient Galaxies

A new technique lets astronomers measure nearly invisible clouds of hydrogen gas from across the universe.

Aerial view of LIGO Hanford


About The LIGO Gravitational-Wave Rumor. . .

Gossip is racing around the physics and astronomy community: has LIGO finally heard its first black-hole merger? Here’s the reality.

Artist's conception of star formation

Stellar Science

New Clues in Cooking up Planets and Stars

An early peak at a forming star system reveals tantalizing clues about its origin.

Zeta Ophiuchi's shock wave

Stellar Science

Telltale Shock Waves from Runaway Stars

Astronomers are now finding dozens of fast-moving runaway stars by searching for the bow shocks they create in interstellar gas and dust.


A Dusty Mystery Around AU Microscopii

Unexplained ripples have been found racing through a dusty disk.

Stellar Science

Twin Stars Simplify Distance Measurements

A new technique that relies on identifying stellar twins yields a novel way to measure the distances to stars.

Black Holes

Black Hole Too Big for its Breeches

A supermassive black hole in the early universe is at least 10 times too heavy for its host galaxy, raising questions about galaxy and black hole coevolution.

Professional Telescopes

Microwave Ovens Spark Radio Signals

After 17 years, researchers using the Parkes radio telescope in Australia have identified the culprit behind a mysterious type of radio signal: two on-site microwave ovens.

Black Holes

Best Evidence Yet That Black Holes Exist

A team of astronomers has found indirect evidence of a supermassive black hole’s event horizon, providing further proof that these wacky objects actually exist in nature.

Scholz's star

Solar System

A Star’s Closest Flyby to the Sun

A red dwarf and its brown dwarf companion buzzed through the outer Oort Cloud some 70,000 years ago, around the time when modern humans began migrating from Africa into Eurasia.


Do Atmospheres Spin Worlds to Habitability?

The best place to look for nearby Earth-size planets are around the smallest, coolest stars. New research shows that any exoplanets tightly circling their stars might have a better chance of being habitable than previously thought.

Black Holes

Watching a Quasar Shut Down

Over the course of ten years, a once-brilliant quasar seems to have stopped gobbling down nearby gas.

Europa's amazing surface

Solar System

Breathtaking View of Icy Moon Europa

A newly processed image from NASA’s Galileo spacecraft shows Europa’s breathtaking beauty and tortured surface in greater detail than ever before.