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Keyword: gravity

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  • Protester Plummets After Climbing Bank Wall in Midtown

    04/02/2021 8:25:14 PM PDT · by grundle · 93 replies
  • Powerful Magnetic Fields Surrounding Black Hole Are Strong Enough to Resist Gravity

    03/25/2021 11:23:42 AM PDT · by Red Badger · 27 replies ^ | MARCH 25, 2021 | By UNIVERSITY OF THE WITWATERSRAND
    Polarized view of the black hole in M87. The lines mark the orientation of polarization, which is related to the magnetic field around the shadow of the black hole. Credit: EHT Collaboration ===================================================================== Wits University astrophysicists are the only two scientists on African continent that contributed to the study. The Event Horizon Telescope (EHT) collaboration, a multinational team of over 300 scientists including two astrophysicists from the University of the Witwatersrand (Wits University), has revealed a new view of the massive object at the center of the M87 galaxy: how it looks in polarized light. This is the first time...
  • What if Dark Matter Doesn’t Exist? Unique Prediction of “Modified Gravity” Challenges Dark Matter Hypothesis

    12/17/2020 8:40:20 AM PST · by Red Badger · 20 replies ^ | By Case Western Reserve University | December 17, 2020
    The best example is represented by the Sunflower galaxy (Messier 63 / NGC 5055) with the strongest external field among SPARC galaxies, whose well-measured rotation curve shows a mildly declining behavior at large radial distance and can be accurately modeled only with an external field effect. Credit: ESA/Hubble & NASA ================================================================= Team of international collaborators detect ‘external field effect,’ a prediction unique to MOND, rival dark matter hypothesis. An international group of scientists, including Case Western Reserve University Astronomy Chair Stacy McGaugh, has published research contending that a rival idea to the popular dark matter hypothesis more accurately predicts a...
  • Hubble Discovery Hints at a Serious Problem With Our Understanding of Dark Matter

    09/11/2020 10:56:00 AM PDT · by Red Badger · 61 replies ^ | 11 SEPTEMBER 2020 | MICHELLE STARR
    It would be extremely optimistic to suggest that we have a good handle on dark matter. But even the slight grasp we do have may be missing something important. New observations from the Hubble Space Telescope have found much higher concentrations of dark matter than expected in some galaxies, by over an order of magnitude. These concentrations are inconsistent with theoretical models, suggesting that there's a big gap in our understanding - the simulations could be incorrect, or there could be a property of dark matter we don't fully understand, according to the research team. "We have done a lot...
  • Pioneering gravity research snags $3 million physics Breakthrough Prize

    09/10/2020 2:48:44 PM PDT · by BenLurkin · 13 replies ^ | 09/10/2020 | Mike Wall
    Eric Adelberger, Jens Gundlach and Blayne Heckel won the 2021 Breakthrough Prize in Fundamental Physics "for precision fundamental measurements that test our understanding of gravity, probe the nature of dark energy and establish limits on couplings to dark matter," Breakthrough Prize representatives announced today (Sept. 10). The trio, leaders of the Eöt-Wash research group at the University of Washington in Seattle, has built equipment sensitive enough to measure gravity, the weakest of nature's four fundamental forces, at incredibly short distances. Such work has helped shape physicists' big-picture understanding of the universe. For example, take the team's research into Isaac Newton's...
  • Search for MH370 Revealed Ocean Crust Waves

    06/12/2020 11:32:16 PM PDT · by SunkenCiv · 7 replies
    Science News by American Geophysical Union ^ | 8 June 2020 | Kimberly M. S. Cartier
    The scans for MH370 revealed that the ocean crust rises and falls in waves that start at the Southeast Indian Ridge and continue outward. The ridge spreads about 35 millimeters in opposite directions every year, and the wave crests, where crust grew faster, are more than 100 kilometers long and repeat every 10-14 kilometers. The researchers estimated when each wave formed by comparing the bathymetry maps to independent measurements and models of the crust's magnetic field. ...Crustal rocks record the polarity of Earth's magnetic field as they form, allowing scientists to trace the age of different sections of ocean crust....
  • Scientists detect unexpected widespread structures near Earth's core

    06/12/2020 9:24:12 AM PDT · by BenLurkin · 32 replies ^ | 06/11/2020 | University of Maryland
    Earthquakes generate seismic waves below Earth's surface that travel thousands of miles. When the waves encounter changes in rock density, temperature or composition, they change speed, bend or scatter, producing echoes that can be detected. Echoes from nearby structures arrive more quickly, while those from larger structures are louder. By measuring the travel time and amplitude of these echoes as they arrive at seismometers in different locations, scientists can develop models of the physical properties of rock hidden below the surface. This process is similar to the way bats echolocate to map their environment Using a machine learning algorithm called...
  • How Earth's mantle is like a Jackson Pollock painting

    05/21/2019 5:55:20 AM PDT · by BenLurkin · 17 replies ^ | 05/20/2019
    Lambart and her colleagues from Wales and the Netherlands, sought to discover what the mantle looks like before it rises as lava at a mid-ocean ridge. They examined cores, drilled through the ocean crust, to look at cumulate minerals: the first minerals to crystallize when the magmas enter the crust. They analyzed the samples centimeter by centimeter to look at variations in isotopes of neodymium and strontium, which can indicate different chemistries of mantle material that come from different types of rock. The amount of isotope variability in the cumulates was seven times greater than that in the mid-ocean ridge...
  • Earth’s Second Magnetic Field: Satellite Image Reveals Invisible Force From Ocean Currents

    04/12/2018 6:58:36 AM PDT · by DUMBGRUNT · 64 replies
    Inquisitr ^ | 12 Apr 2018 | Mia Lorenzo
    The Earth has a second magnetic field, one generated by ocean currents. Researchers know little about it, but images captured by satellites show this invisible force generated by the world’s salty oceans in perfect detail. ... ESA released a video detailing the changes in the Earth’s magnetic field over a 24-hour period... ...“It’s a really tiny magnetic field. It’s about 2-2.5 nanotesla at satellite altitude, which is about 20,000 times weaker than the Earth’s global magnetic field.”... Oceans may have a small contribution to the magnetic field that protects the planet from harmful cosmic rays, but it remains to be...
  • Potato Earth: Gravity satellite reveals what our planet REALLY looks like

    03/31/2011 5:40:51 PM PDT · by Free ThinkerNY · 48 replies ^ | March 31, 2011 | Daily Mail Reporter
    At first glance it looks like a potato-shaped asteroid flying through space. But this multi-coloured image is actually the Earth - and shows how gravity varies on different parts of the globe. The images were unveiled today by the team behind the GOCE satellite at a conference in Munich and are the most accurate ever released. The 'geoid' map, as it is known, is used to illustrate how oceans would look in the absence of currents or tides. The bright yellow colours show gravity at its strongest, while it is at its weakest in the blue areas. There appears to...
  • Exploring The Ocean Basins With Satellite Altimeter Data

    03/28/2005 10:10:48 AM PST · by SunkenCiv · 7 replies · 586+ views
    National Geophysical Data Center, National Oceanic and Atmospheric Administration ^ | Tue Nov 25 2004 (apparently) | David T. Sandwell and Walter H. F. Smith
    The reason that the ocean floor, especially the southern hemisphere oceans, is so poorly charted is that electromagnetic waves cannot penetrate the deep ocean (3-5 km = 2-3 mi). Instead, depths are commonly measured by timing the two-way travel time of an acoustic pulse. However because research vessels travel quite slowly (6m/s = 12 knots) it would take approximately 125 years to chart the ocean basins using the latest swath-mapping tools. To date, only a small fraction of the sea floor has been charted by ships. Fortunately, such a major mapping program is largely unnecessary because the ocean surface has...
  • Astronomy Picture Of The Day : A Gravity Map of Earth

    11/13/2001 5:27:19 AM PST · by callisto · 63 replies · 2,880+ views
    NASA ^ | 11.13.01 | Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
    Astronomy Picture of the Day 2001 November 13 A Gravity Map of Earth Credit: JPL, NASA Explanation: Is gravity the same over the surface of the Earth? No -- it turns out that in some places you will feel slightly heavier than others. The above relief map shows in exaggerated highs and lows where the gravitational field of Earth is relatively strong and weak. A low spot can be seen just off the coast of India, while a relative high occurs in the South Pacific Ocean. The cause of these irregularities is unknown since present surface features do not ...
  • Has physicist's gravity theory solved 'impossible' dark energy riddle?

    01/27/2020 6:34:00 AM PST · by Red Badger · 71 replies ^ | Sat 25 Jan 2020 06.40 EST | Hannah Devlin Science correspondent
    Prof Claudia de Rham’s ‘massive gravity’ theory could explain why universe expansion is accelerating Cosmologists don’t enter their profession to tackle the easy questions, but there is one paradox that has reached staggering proportions. Since the big bang, the universe has been expanding, but the known laws of physics suggest that the inward tug of gravity should be slowing down this expansion. In reality, though, the universe is ballooning at an accelerating rate. Scientists have come up with a name – dark energy – for the mysterious agent that is allowing the cosmos to expand so rapidly and which is...
  • Astronomers Just Detected a Second, Epic Neutron Star Collision

    01/08/2020 10:04:26 AM PST · by C19fan · 23 replies
    Science Alert ^ | January 7, 2020 | Michelle Star
    Our magnificent gravitational wave astronomers have done it again, adding to the detection collection a new collision between two neutron stars. On 25 April 2019, the LIGO interferometer detected two neutron stars around 520 million light-years away coming together and merging into a single object. It's called GW190425, and although it's only the second such collision astronomers have ever seen, it's already broadening our understanding of these colossal cosmic smash-ups.
  • Something Strange Sends Tech Haywire at Earth's Poles, And NASA Wants to Know More

    11/30/2019 7:11:33 AM PST · by BenLurkin · 47 replies
    Live Science ^ | 11/28/2019 | david Nield
    If you venture too close to one of Earth's poles, you'll notice something rather strange happening to any gadgets using radio waves, satellite connections, or GPS. NASA is backing a range of initiatives to investigate the northern polar cusp, a funnel in space that's thought to be behind some of the weird space phenomena happening above the poles. This funnel, and the matching one at the South Pole, allows solar winds from the Sun to get right down to Earth's atmosphere – in other words, here the solar winds aren't reflected back out into space by the Earth's magnetic field,...
  • Scientists model Mercury's glaciers

    12/28/2018 11:08:58 AM PST · by ETL · 17 replies ^ | December 28, 2018 | Margaret Nagle, University of Maine
    The processes that led to glaciation at the cratered poles of Mercury, the planet closest to the sun, have been modeled by a University of Maine-led research team. James Fastook, a UMaine professor of computer science and Climate Change Institute researcher, and James Head and Ariel Deutsch of Brown University, studied the accumulation and flow of ice on Mercury, and how the glacial deposits on the smallest planet in our solar system compare to those on Earth and Mars.Their findings, published in the journal Icarus, add to our understanding of how Mercury's ice accumulations—estimated to be less than 50 million...
  • Vast asteroid created 'Man in Moon's eye' crater

    07/20/2016 5:42:28 PM PDT · by MtnClimber · 20 replies
    BBC ^ | Rebecca Morelle
    One of the Moon's biggest craters was created by an asteroid more than 250km (150 miles) across, a study suggests. It smashed into the lunar surface about 3.8 billion years ago, forming Mare Imbrium - the feature also known as the right eye of the "Man in the Moon". Scientists say the asteroid was three times bigger than previously estimated and debris from the collision would have rained down on the Earth. The asteroid was so big it could be classified as a protoplanet - a space rock with the potential to become a fully formed world. Lead author Prof...
  • Astronomy Picture of the Day -- Gravitational Anomalies of Mercury

    05/05/2015 4:09:19 AM PDT · by SunkenCiv · 4 replies
    NASA ^ | May 05, 2015 | (see photo credit)
    Explanation: What's that under the surface of Mercury? The robotic MESSENGER spacecraft that had been orbiting planet Mercury for the past four years had been transmitting its data back to Earth with radio waves of very precise energy. The planet's gravity, however, slightly changed this energy when measured on Earth, which enabled the reconstruction of a gravity map of unprecedented precision. Here gravitational anomalies are shown in false-color, superposed on an image of the planet's cratered surface. Red hues indicate areas of slightly higher gravity, which in turn indicates areas that must have unusually dense matter under the surface. The...
  • Scientists detect a black hole swallowing a neutron star

    08/19/2019 8:44:11 AM PDT · by C19fan · 38 replies ^ | August 19, 2019 | Staff
    Scientists, including from The Australian National University (ANU), say they have detected a black hole swallowing a neutron star for the first time. Neutron stars and black holes are the super-dense remains of dead stars. On Wednesday 14 August 2019, gravitational-wave discovery machines in the United States and Italy detected ripples in space and time from a cataclysmic event that happened about 8,550 million trillion kilometres away from Earth.
  • Physicists Wonder: Why Has No One Been Killed by Dark Matter?

    07/18/2019 6:09:07 AM PDT · by C19fan · 97 replies
    Gizmodo ^ | July 17, 2019 | Ryan F. Mandelbaum
    The fact that no one has died from being struck by dark matter is enough proof to rule out certain ideas about the mysterious stuff, according to one new theory paper. There’s a conundrum facing physicists: Most of the universe’s mass appears to be missing, based on observations of the universe’s structure, how galaxies move, and how they seem to warp distant light. Thousands of physicists are now hunting for what might be producing these effects. But the mere fact that we’re alive here on Earth can offer some insight as to what dark matter isn’t, and the researchers behind...