121–140 of 237 results

People, Places, and Events

Cosmologist Halton Arp (1927-2013)

A contentious yet gifted astronomer, Arp challenged a key underpinning of the Big Bang throughout the 1970s and 1980s and ultimately fell into disfavor among his colleagues.

Exotic triowith a pulsar

Cosmology

Exotic Stellar Trio Includes Pulsar

Imagine a three-star system with two white dwarfs and a wildly spinning, superdense neutron star, all packed within a space no bigger than Earth's orbit.

Cosmology

Gaia Launches to Pinpoint a Billion Stars

Gaia launched flawlessly Thursday morning at 9:12 UTC (4:12 a.m. Eastern Standard Time). This long-awaited mission will precisely map the distances and motions of 1 billion stars in our galaxy.

Cosmology

Triple Collision in Infant Galaxy

A complex of three bright, star-forming clumps called Himiko is merging in the early universe. With its light reaching us from when the universe was only 800 million years old, this primordial galaxy could yield insight into the elusive process of early galaxy formation.

Cosmology

Two Blows for Dark Matter Model

Two recent experiments limit physicists’ favorite candidate for the elusive and invisible matter lurking in the universe.

Galaxies

A Galaxy Near Cosmic Dawn

Astronomers have confirmed that light from a distant galaxy is reaching us from about 700 million years after the Big Bang. The galaxy's emission hints that star formation during that era might have proceeded at a much faster rate than previously thought.

Cosmology

Planck Spacecraft Shut Down

After four years of exquisite observations, the latest mission to study the universe's earliest light has been shuttered. But this end is a happy one and comes with a significant cosmological legacy.

Cosmology

Seeking the Cosmic Dawn

Astronomers have finally detected a much-hoped-for pattern in the afterglow of the Big Bang, and it might help reveal inflation's signature.

Stellar Science

Mystery Signals from Space

Four powerful radio bursts have left astronomers scratching their heads. The bursts appear to come from several billion light-years away and could provide a whole new look at the universe — but observers aren't sure what they are.

Stellar Science

Universe's Lithium Problem A Bit Better

Studies of primitive stars suggest the universe has far too little of one form of lithium and far too much of another. But new work shows that the second problem might be nonexistent.

Stellar Science

Weighing in on Einstein's Gravity

A massive neutron star and its lightweight sidekick provide a unique space laboratory to test general relativity. So far, gravity keeps behaving as it's supposed to.

Cosmology

Homing in on Dark Matter

Three potential detections from deep underground could be from dark matter particles. While still uncertain, the result suggests a particle mass in keeping with hints from several other experiments.

Cosmology

Possible Dark Matter Signal?

Scientists using an instrument aboard the International Space Station have measured a signal that might come from dark matter — or might not.

Spacecraft and Space Missions

Planck: Best Map Yet of Cosmic Creation

Planck mission scientists have released the first half of their observations of the cosmic microwave background. The results are a stunning confirmation of today's standard model for how the universe formed and grew. But they also raise some head-scratchers.

Spacecraft and Space Missions

(Really) Cool View of Andromeda Galaxy

Nearing the end of its mission, ESA's Herschel Space Observatory has delivered a highly detailed map of extremely cold gas and dust in the iconic Andromeda Galaxy.

NGC 6872, the largest spiral galaxy

Cosmology

NGC 6872: The Largest Spiral Galaxy

Our Milky Way ranks near the top in the pecking order of spiral galaxies, but it's no match for an enormous "island universe" in the constellation Pavo that is more than 500,000 light-years across.

Cosmology

Beyond the Standard Model — Or Not

Scientists keep trying to disprove the Standard Model that governs modern physics. And they keep failing.

distant galaxies seen by Hubble

Galaxies

Hubble Takes Galaxy Census

New observations by the Hubble Space Telescope reveal some of the earliest galaxies in the universe.

Cosmology

Cosmic Web Weeds Dwarf Galaxies

Astronomers have discovered an unexpected explanation for why they can only find a small fraction of the satellite galaxies the Milky Way is supposed to have.

Cosmology

Fermi Detects Cosmic Fog

An international team has used the disappearance of high-energy photons to narrow in on the origin of the light suffusing the cosmos.

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