1–20 of 217 results

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.

Perseus Cluster

Cosmology

Astronomers Rein in Possibilities for Exotic Particle

Astronomers observing a distant galaxy have dramatically shrunk the range of possible properties of a long-predicted — but never-detected — subatomic particle.

Pulsar-white dwarf pair

Cosmology

White Dwarf’s Whirlwind Spin Drags Spacetime

Astronomers have used observations of a tight white dwarf-neutron star pair to confirm an aspect of Einstein's general theory of relativity.

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.

Cosmic web filaments

Cosmology

Best Image Yet of the Cosmic Web

Using the light cast by galaxies bursting with new stars, astronomers have mapped out a piece of the cosmic web 12 billion light-years from Earth.

Red giant stars in galaxy halos

Cosmology

Tension Over Hubble Constant Continues

A new measurement fuels an ongoing debate about the rate at which today’s universe is expanding.

GD-1 and Palomar 5

Milky Way

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.

Helium hydride found in NGC 7027

Cosmology

Astronomers Find Universe’s First Molecule

After decades of searching, astronomers have definitively detected helium hydride, the first molecule to form in the early universe.

Quasars as standard candles

Cosmology

What Quasars Can Teach Us About Dark Energy

Astronomers have found a way to turn quasars into standard candles, with potentially far-reaching implications for the nature of mysterious dark energy.

Gamma-ray map of sky

Cosmology

Starlight Tally Reveals Cosmic History of Star Formation

Nearly 11 billion years ago, the universe churned out stars at a rate 10 times greater than today. And yet all the starlight in the cosmos appears no brighter on the sky than a 60-watt light bulb seen from miles away.

halosat 1

Astronomy in Space with David Dickinson

HaloSat: A Small Satellite for a Big Question

HaloSat, a mini-satellite recently deployed from the International Space Station, is on the hunt for the universe's missing matter.

Gravitational Lensing: Einstein Ring

Cosmology

Best Test of General Relativity on Galaxy Scales

Astronomers have conducted the best, galaxy-scale test of general relativity yet, and it rules out some (but not all) theories of modified gravity.

Pulsar-white dwarf binary

Cosmology

Pulsar Limits “Fifth Force” Interactions with Dark Matter

A recent experiment to better understand the nature of dark matter constrains a possible "fifth force" of nature to almost zero.

Dusty starburst galaxy (art)

Cosmology

Too Many Massive Stars in Universe's Youngest Galaxies

A new method of measuring star formation in the earliest galaxies finds that they’re producing more massive stars than expected — a result that could affect our understanding of how galaxies grow their stars.

Earliest star formation in a far-away galaxy

Cosmology

Early Star Formation Presents New Cosmic Mystery

New observations suggest that stars were forming just 250 million years after the Big Bang — a record-breaker that will likely open a new line of cosmological inquiry.

MUSE-Hubble Ultra Deep Field

Cosmology

Hawking Takes on the Infinite Multiverse

Stephen Hawking’s last paper on cosmology, published posthumously, might solve the problem of eternal inflation, a theory that suggests our cosmos is but one in a sea of infinite universes.

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.

Dark matter vs. ordinary matter in IllustrisTNG

Cosmology

Simulating the Universe: The Next Generation

A new suite of cosmological simulations sheds light on the interconnected cosmic processes that shape the universe.

Cosmology

Dark Energy Survey Releases First Three Years of Data

Results from the first data release of the Dark Energy Survey include eleven new stellar streams in the Milky Way galaxy.

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