Dark Matter

Dark Matter News -- ScienceDaily Dark Matter and Dark Energy. Read what astronomers are discovering about a gaping hole in the universe, how dark matter clumps contribute to galaxy formation and more. Space images.

  • Doing without dark energy
    on December 14, 2017 at 3:08 pm

    Three mathematicians have a different explanation for the accelerating expansion of the universe that does without theories of 'dark energy.' Einstein's original equations for General Relativity actually predict cosmic acceleration due to an 'instability,' they argue in a new paper. […]

  • Galaxy growth in a massive halo in the first billion years of cosmic history
    on December 7, 2017 at 7:07 pm

    Observations of two galaxies made with the National Science Foundation-funded Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope suggest that large galaxies formed faster than scientists had previously thought. […]

  • Heavy metal: How first supernovae altered early star formation
    on December 6, 2017 at 7:23 pm

    An international team of researchers ran multi-scale, multi-physics 2-D and 3-D simulations to illustrate how heavy metals expelled from exploding supernovae held the first stars in the universe regulate subsequent star formation and influence the appearance of galaxies in the process. […]

  • ALMA finds massive primordial galaxies swimming in vast ocean of dark matter
    on December 6, 2017 at 6:20 pm

    New observations push back the epoch of massive-galaxy formation even further by identifying two giant galaxies seen when the universe was only 780 million years old, or about 5 percent its current age. […]

  • How does it look when Earth is bombarded with dark matter?
    on December 6, 2017 at 5:25 pm

    A whole lot of zig-zagging: Perhaps that is what happens when the universe's mysterious dark matter particles hit the Earth. Researchers can now show through simulations how it might look. […]

  • MACHOs are dead, WIMPs are a no-show -- say hello to SIMPs
    on December 4, 2017 at 9:23 pm

    The nature of dark matter remains elusive, with numerous experimental searches for WIMPs coming up empty-handed and MACHOs all but abandoned. Theorists have proposed a different type of dark matter particle, a strongly interacting massive particle or SIMP, that differs from WIMPs in that they interact strongly with one another and hardly at all with normal matter. The dark matter structure of a galaxy pile-up could be evidence for SIMPs. […]

  • Gravitational waves could shed light on the origin of black holes
    on November 30, 2017 at 7:10 pm

    The detection of gravitational waves has given astronomers a new way of looking at the universe, and a new study shows how these ripples in the fabric of spacetime might confirm or rule out the existence of a certain type of black hole. […]

  • First proper motions measured of stars in a small galaxy outside the Milky Way
    on November 27, 2017 at 5:47 pm

    By combining data from the Hubble Space Telescope and the Gaia mission, astronomers have been able to measure the proper motion of 15 stars in the Sculptor Galaxy, the first such measurement outside the Milky Way. Analysis shows an unexpected preference in the direction of movement, which suggests that the standard theoretical models used to describe the motion of stars and dark matter halos in other galaxies might be invalid. […]

  • Dark matter and dark energy: Do they really exist?
    on November 22, 2017 at 4:30 pm

    Researchers have hypothesized that the universe contains a 'dark matter.' They have also posited the existence of a 'dark energy.' These two hypotheses account for the movement of stars in galaxies and for the accelerating expansion of the universe. But, according to a researcher, these concepts may be no longer valid: the phenomena can be demonstrated without them. This research exploits a new theoretical model based on the scale invariance of the empty space. […]

  • On the origins of star stuff: Shedding new light on origin of anti-matter
    on November 16, 2017 at 7:20 pm

    Astronomers have used a high-altitude observatory in Mexico to better understand where gamma rays come from. More than 300 massive water tanks sit waiting at the site for cascades of particles initiated by high-energy packets of light called gamma rays -- many of which have more than a million times the energy of a dental X-ray. When these gamma rays smash into the upper atmosphere, they blast apart atoms in the air, producing a shower of particles that moves at nearly the speed of light toward the ground. When this shower reaches HAWC's tanks, it produces coordinated flashes of blue light in the water, allowing researchers to reconstruct the energy and cosmic origin of the gamma ray that kicked off the cascade. […]

  • Hunt for dark matter is narrowed
    on November 15, 2017 at 5:46 pm

    Scientists have disproved the existence of a specific type of axion -- an important candidate 'dark matter' particle -- across a wide range of its possible masses. […]

  • First direct measurements of high energy electrons in space
    on November 3, 2017 at 2:58 pm

    The CALET Cosmic Ray experiment has successfully carried out the high-precision measurement of cosmic-ray electron spectrum up to 3 tera electron volts (TeV) by using the CALorimetric Electron Telescope (CALET) on the Japanese Experimental Module, the Exposed Facility on the International Space Station. […]

  • Shedding light on the mystery of matter accretion in young stars
    on November 2, 2017 at 10:03 pm

    Astronomers are shedding light on the mystery of matter accretion in young stars. Their discovery helps explain how matter accumulates on the surface of a young star and reconciles the theory behind and observations on the accretion process -- a matter of debate among astrophysicists because of the limited number of theoretical models and actual observations. […]

  • One step closer to defining dark matter, GPS satellite atomic clocks on the hunt
    on November 1, 2017 at 5:03 pm

    One professor who studies the earth and one who studies space came together in the pursuit to detect and define dark matter. They are one step closer. Using 16 years of archival data from GPS satellites that that orbit the earth, the team looked for dark matter clumps in the shape of walls or bubbles and which would extend far out beyond the GPS orbits, the solar system and beyond. […]

  • Newest dark matter map hints at where astrophysics must go for breakthroughs
    on October 31, 2017 at 5:03 pm

    Three astrophysicists -- Scott Dodelson, Risa Wechsler and George Efstathiou -- recently participated in a roundtable discussion, hosted by The Kavli Foundation, about new data from the Dark Energy Survey and its implications for understanding the universe's history. […]

  • Wobbling galaxies: New evidence for dark matter makes it even more exotic
    on October 26, 2017 at 2:31 pm

    Astronomers have discovered that the brightest galaxies within galaxy clusters 'wobble' relative to the cluster's center of mass. This unexpected result is inconsistent with predictions made by the current standard model of dark matter. With further analysis it may provide insights into the nature of dark matter, perhaps even indicating that new physics is at work. […]

  • Astronomers find potential solution into how planets form
    on October 13, 2017 at 4:32 pm

    The quest to discover how planets found in the far reaches of the universe are born has taken a new, crucial twist. […]

  • Astronomers reveal evidence of dynamical dark energy
    on October 3, 2017 at 3:10 pm

    Astronomers found that the nature of dark energy may not be the cosmological constant introduced by Albert Einstein 100 years ago. This is crucial for the study of dark energy. […]

  • Supersonic gas streams left over from the Big Bang drive massive black hole formation
    on September 28, 2017 at 6:20 pm

    A super-computer simulation by an international team of researchers has shown the formation of a rapidly growing star from supersonic gas streams in the early universe left over from the Big Bang. The star ends its life with catastrophic collapse to leave a black hole with a mass of 34,000 times that of the Sun. […]

  • Cartography of the Cosmos
    on September 26, 2017 at 1:16 pm

    There are hundreds of billions of stars in our own Milky Way galaxy, interspersed with all manner of matter, from the dark to the sublime. This is the universe that one group of researchers is trying to reconstruct, structure by structure, combining telescope surveys with next-generation data analysis and simulation techniques currently being primed for exascale computing. […]

  • Is the Milky Way an 'outlier' galaxy? Studying its 'siblings' for clues
    on September 20, 2017 at 3:33 pm

    The most-studied galaxy in the universe -- the Milky Way -- might not be as 'typical' as previously thought, according to a new study. Early results from the Satellites Around Galactic Analogs (SAGA) Survey indicate that the Milky Way's satellites are much more tranquil than other systems of comparable luminosity and environment. Many satellites of those 'sibling' galaxies are actively pumping out new stars, but the Milky Way's satellites are mostly inert. […]

  • Physicists offer explanation for diverse galaxy rotations
    on September 14, 2017 at 7:22 pm

    Physicists have found a simple and viable explanation for the diversity observed in galactic rotations. They report that diverse galactic-rotation curves, a graph of rotation speeds at different distances from the center, can be naturally explained if dark matter particles are assumed to strongly collide with one another in the inner halo, close to the galaxy's center -- a process called dark matter self-interaction. […]

  • New supernova analysis reframes dark energy debate
    on September 13, 2017 at 11:31 pm

    The accelerating expansion of the Universe may not be real, but could just be an apparent effect, according to new research. The new study finds the fit of Type Ia supernovae to a model universe with no dark energy to be very slightly better than the fit to the standard dark energy model. […]

  • Superhuman 'night' vision during the total eclipse?
    on September 5, 2017 at 8:40 pm

    It was dark as night during the recent total solar eclipse, yet people and objects were easier to see than on a typical moonless night. Scientists have discovered a possible biological explanation -- the presence (or absence) of a protein in the retina known as a GABA receptor. […]

  • What lit up the universe? Black holes may have punctured darkened galaxies, allowing light to escape
    on August 30, 2017 at 3:48 pm

    Researchers have a new explanation for how the universe changed from darkness to light. They propose that black holes within galaxies produce winds strong enough to fling out matter that punctures holes in galaxies, allowing light to escape. […]

  • A silent search for dark matter
    on August 22, 2017 at 3:30 pm

    Results from its first run indicate that XENON1T is the most sensitive dark matter detector on Earth. The sensitivity of the detector -- an underground sentinel awaiting a collision that would confirm a hypothesis - stems from both its size and its 'silence.' […]

  • Cosmic velocity web: Motions of thousands of galaxies mapped
    on August 15, 2017 at 1:51 pm

    The cosmic web -- the distribution of matter on the largest scales in the universe -- has usually been defined through the distribution of galaxies. Now, a new study by a team of astronomers demonstrates a novel approach. Instead of using galaxy positions, they mapped the motions of thousands of galaxies. […]

  • New theory on the origin of dark matter
    on August 8, 2017 at 6:59 pm

    Scientists have come up with a new theory on how dark matter may have been formed shortly after the origin of the universe. This new model proposes an alternative to the WIMP paradigm that is the subject of various experiments in current research. […]

  • Primordial black holes may have helped to forge heavy elements
    on August 4, 2017 at 5:18 pm

    Astronomers like to say we are the byproducts of stars, stellar furnaces that long ago fused hydrogen and helium into the elements needed for life through the process of stellar nucleosynthesis. But what about the heavier elements in the periodic chart, elements such as gold, platinum and uranium? Astronomers believe most of these "r-process elements" -- elements much heavier than iron -- were created, either in the aftermath of the collapse of massive stars and the associated supernova explosions, or in the merging of binary neutron star systems. […]

  • Dark Energy Survey reveals most accurate measurement of universe's dark matter
    on August 3, 2017 at 4:06 pm

    Dark Energy Survey scientists have unveiled the most accurate measurement ever made of the present large-scale structure of the universe. These measurements of the amount and 'clumpiness' (or distribution) of dark matter in the present-day cosmos were made with a precision that, for the first time, rivals that of inferences from the early universe by the European Space Agency's orbiting Planck observatory. […]