201–220 of 240 results
LIGO gravity-wave detector

Cosmology

New Limits on the Big Bang

LIGO, the Laser Interferometer Gravitational-wave Observatory, has just announced its first big astronomy result: Two years of data rule out certain versions of the inflationary-universe theory of what drove the Big Bang.

Map of gamma-ray pulsars

Cosmology

Fermi Tracks Gamma-ray Pulsars

What spins hundreds of times per second, has 100 trillion times the Sun's density, and spews lethal radiation all over interstellar space? Astronomers are closer to knowing the answers, thanks to NASA's newest deep-space observatory.

Cosmology

Image Stacking Nets Ancient Supernovae

Astronomers have turned up a pair of supernovae in extremely distant galaxies (like these) that exploded more than 11 billion years ago, during the universe's infancy. And they did it using a basic technique familiar to thousands of amateur astronomers.

Cosmology

New Candidates for Midsize Black Holes

Astronomers are hot on the trail of a new class of cosmic curiosity that's not too small, not too big, but somewhere in between — an intermediate-mass black hole.

Cosmology

Dark Matter or Pulsars? Fermi is on the Case

Something funny is going on within a few hundred light-years of us, creating high-energy electrons that we don't understand. Recent data from NASA’s Fermi Gamma-ray Space Telescope keep the mystery alive.

Spacecraft and Space Missions

Planck and Herschel to Probe Inflation and Starbirth

The Herschel Space Observatory and the Planck Surveyor, launched May 14th on a single Ariane 5 rocket, will peer deeply into dust clouds and map the microwave background.

Cosmology

Introducing "Himiko," the Primordial Blob

An international team of researchers has turned up a galaxy-size object at the dawn of the universe.

Cosmology

The Farthest Thing Ever Seen

NASA has announced finding a gamma-ray burst with a redshift of about 8.2. That puts it 95% of the way back to the Big Bang.

Cosmology

Bantamweight Planet and Three Dwarfs

Observing teams have turned up the lowest-mass planet yet detected around a Sunlike star — and a clutch of objects too small to be stars but not really planets either.

Cosmology

A Murky All-Sky Background Is Resolved

It doesn't look like much today, but the far-infrared background radiation coming from all parts of the sky tells of a tumultuous early universe ablaze with starlight.

Cosmology

Best-Ever Southern-Sky Galaxy Survey

Take one telescope, use it to record the spectra of 150 galaxies at a time for 4½ years, and what do you get? Awesome 3D maps of deep intergalactic space — and important clues to how the universe works.

Cosmology

Gamma-Ray Burst Hints of Space-Time Foam

Observations from NASA’s orbiting Fermi observatory hint that extremely high-energy gamma rays don't travel at the speed of light. If more observations bear this out, it will rock the foundations of physics, hint at small-scale "space-time foam," and perhaps point the way to a "theory of everything."

Spacecraft and Space Missions

A Supermassive Double Black Hole?

A far-off quasar seems to contain two giant black holes hurtling around each other less than a light-year apart. They're doomed to spiral together and join in a literally space-shaking crash — but when?

Cosmology

New Cosmic Background Radiation Found

Astronomers have found something in the very distant universe filling the sky with a radio roar at frequencies they did not expect. No one knows what it is.

Cosmology

Black Holes First, Galaxies Second

Back when the universe was young, a new study finds, galaxies grew their central black holes faster than the holes' starry surroundings. But how?

Our expanding universe

Cosmology

Dark Energy: Real and Overwhelming

The universe just isn't making galaxy clusters the way it used to. Compelling new evidence argues that "dark energy" has overwhelmed gravity's influence on forming these largest cosmic structures.

Professional Telescopes

New Eyes on the Cosmic-Ray Sky

High on the Argentinian pampa, 1,600 water-filled "eyes" await the arrival of the most powerful high-energy particles in the universe.

Cosmology

Hubble Finds a Mystery Object

What was it? While monitoring a cluster of galaxies, the Hubble Space Telescope recorded what seems like a new class of astronomical object brightening and fading over six months.

Cosmology

Lensed Light Used to Weigh Dark Matter

Astronomers use a novel method of weighing distant galaxies to measure their masses and find that there's more matter than the galaxies' light can easily explain.

Cosmology

Dark Energy's Early Fingerprints

Studying the effect of galaxy clusters on the background radiation from the early universe, University of Hawaii astronomers have added to the pile of evidence for dark energy.

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