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E.g., 11/15/2018
E.g., 11/15/2018
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Your search has returned 145 articles:
  • Feature

    Simulating the universe using Einstein’s theory of gravity may solve cosmic puzzles

    If the universe were a soup, it would be more of a chunky minestrone than a silky-smooth tomato bisque.

    Sprinkled with matter that clumps together due to the insatiable pull of gravity, the universe is a network of dense galaxy clusters and filaments — the hearty beans and vegetables of the cosmic stew. Meanwhile, relatively desolate pockets of the cosmos, known as voids, make up a thin...

    11/14/2017 - 15:30 Cosmology
  • News

    What detecting gravitational waves means for the expansion of the universe

    Ripples in spacetime travel at the speed of light. That fact, confirmed by the recent detection of a pair of colliding stellar corpses, kills a whole category of theories that mess with the laws of gravity to explain why the universe is expanding as fast as it is.

    On October 16, physicists announced that the Advanced Laser Interferometer Gravitational-Wave Observatory, LIGO, had detected...

    10/24/2017 - 17:34 Cosmology
  • News

    How to make the cosmic web give up the matter it’s hiding

    Evidence is piling up that much of the universe’s missing matter is lurking along the strands of a vast cosmic web.

    A pair of papers report some of the best signs yet of hot gas in the spaces between galaxy clusters, possibly enough to represent the half of all ordinary matter previously unaccounted for. Previous studies have hinted at this missing matter, but a new search technique is...

    10/11/2017 - 07:00 Astronomy, Cosmology
  • Science Visualized

    Map reveals the invisible universe of dark matter

    View the video

    Scientists have created the largest map of dark matter yet, part of a slew of new measurements that help pin down the universe’s dark contents. Covering about a thirtieth of the sky, the map (above) charts the density of both normal matter — the stuff that’s visible — and dark matter, an unidentified but far more abundant substance that pervades the cosmos.

    Matter of...

    08/25/2017 - 07:00 Cosmology
  • Science Ticker

    The most distant star ever spotted is 9 billion light-years away

    The most distant star ever observed has been spotted, and its light comes from across two-thirds of the universe. That puts the star a whopping 9 billion light-years away.

    Patrick Kelly at the University of California, Berkeley and his colleagues found the star in Hubble Space Telescope images of a galaxy cluster called MACS J1149. In April and May 2016, Kelly and his team saw a...

    07/11/2017 - 16:51 Astronomy, Cosmology
  • Science Ticker

    Satellite trio will hunt gravitational waves from space

    The hunt for gravitational waves is moving upward. A space-based detector called the Laser Interferometer Space Antenna, or LISA, was selected as a mission in the European Space Agency’s science program, the agency announced June 20.

    LISA will consist of three identical satellites arranged in a triangle that will cartwheel through space in orbit around the sun just behind Earth. The...

    06/20/2017 - 16:58 Astronomy, Cosmology, Physics
  • News in Brief

    Milky Way’s loner status is upheld

    If the Milky Way exists in the biggest cosmic void ever observed, that could solve a puzzling mismatch between ways to measure how fast the universe is expanding.

    Observations of 120,000 galaxies bolstering the Milky Way’s loner status were presented by Benjamin Hoscheit June 7 at a meeting of the American Astronomical Society in Austin, Texas. Building on earlier work by his adviser,...

    06/07/2017 - 17:47 Cosmology
  • Context

    Einstein’s latest anniversary marks the birth of modern cosmology

    First of two parts

    Sometimes it seems like every year offers an occasion to celebrate some sort of Einstein anniversary.

    In 2015, everybody lauded the 100th anniversary of his general theory of relativity. Last year, scientists celebrated the centennial of his prediction of gravitational waves — by reporting the discovery of gravitational waves. And this year marks the centennial...

    04/11/2017 - 11:45 History of Science, Cosmology
  • News

    Distant galaxies lack dark matter, study suggests

    Very distant galaxies have surprisingly little dark matter, the invisible stuff thought to make up the bulk of matter in the universe, new observations suggest.

    Stars in the outer regions of some far-off galaxies move more slowly than stars closer to the center, indicating a lack of dark matter, astronomer Reinhard Genzel and colleagues report online March 15 in Nature. If confirmed, the...

    03/15/2017 - 14:00 Astronomy, Cosmology
  • News

    Astronomers detect oldest known stardust in distant galaxy

    Astronomers may have spotted some of the earliest stardust ever created in the cosmos.

    Astrophysicist Nicolas Laporte of University College London and colleagues detected the dust in a galaxy seen as it was when the universe was only 600 million years old. “We are probably seeing the first stardust of the universe,” Laporte says. The observations, published online March 8 in the...

    03/08/2017 - 06:00 Astronomy, Cosmology