21–40 of 233 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

Spacecraft and Space Missions

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)

Stellar Science

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.

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.

cosmic time and quasar

Cosmology

Most Distant Black Hole Yet

Astronomers have discovered a supermassive black hole scarfing down gas just 690 million years after the Big Bang.

five black hole mergers

Cosmology

LIGO Sees Smallest Black Hole Binary Yet

LIGO has detected another black hole merger, raising the tally to five.

Neutron star collision

Stellar Science

Astronomers Catch Gravitational Waves from Colliding Neutron Stars

Spacetime ripples from the neutron star smash-up usher in the age of multi-messenger astronomy.

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