1–10 of 215 results
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

Cosmology

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.

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