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Keyword: gravity

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  • ‘It’s a miracle’: Skydiver survives hitting ground at 80 mph

    04/16/2022 1:25:04 PM PDT · by BenLurkin · 65 replies
    KTLA ^ | Apr 16, 2022 / | Elizabeth Jassin, Ashleigh Banfield
    Jordan Hatmaker was skydiving in November when the worst thing that could happen happened: Her parachute didn’t open. The plane was more than 13,000 feet above the ground when she jumped, and she hit the ground at about 80 miles per hour. Hatmaker’s reserve parachute did actually deploy, but it made her main parachute pop out at the same time. “They pulled away from each other in the air and then dragged me down in kind of a spiral motion,” she explained. Once she realized she was going down, Hatmaker had one minute before she hit the ground. Hatmaker believes...
  • First Rogue Black Hole Ever Discovered – And It’s Only 5,000 Light-Years Away

    02/09/2022 9:01:59 AM PST · by Red Badger · 31 replies
    https://scitechdaily.com ^ | FEBRUARY 7, 2022 | By ANDY TOMASWICK, UNIVERSE TODAY
    Microlensing strikes again. Astronomers have been using the technique to detect everything from rogue planets to the most distant star ever seen. Now, astronomers have officially found another elusive object that has long been theorized, and that Universe Today first reported on back in 2009 but has never directly detected – a rogue black hole. That detection comes at the end of a 6-year observational campaign, with dozens of authors collaborating on a paper recently published in arXiv (meaning it has not yet been peer-reviewed). Those six years of painstakingly gathered data all started back in 2011, when a star...
  • In a Numerical Coincidence, Some See Evidence for String Theory

    01/21/2022 12:44:34 PM PST · by Red Badger · 35 replies
    https://www.quantamagazine.org ^ | January 21, 2022 | Natalie Wolchover
    In a quest to map out a quantum theory of gravity, researchers have used logical rules to calculate how much Einstein’s theory must change. The result matches string theory perfectly. 4 ========================================================================== Quantum gravity researchers use α to denote the size of the biggest quantum correction to Einstein’s general relativity. Recently, three physicists calculated a number pertaining to the quantum nature of gravity. When they saw the value, “we couldn’t believe it,” said Pedro Vieira, one of the three. Gravity’s quantum-scale details are not something physicists usually know how to quantify, but the trio attacked the problem using an approach...
  • Korea Zinc agrees to invest US$50m in gravity storage startup Energy Vault ahead of NYSE listing

    01/08/2022 2:48:37 AM PST · by M. Dodge Thomas · 24 replies
    Energy Storage News ^ | January 6, 2022 | Andy Colthorpe
    Gravity-based energy storage technology company Energy Vault has formed a strategic partnership with non-ferrous metals smelting and refinery company Korea Zinc, including a US$50 million investment commitment. The announcement, made yesterday, comes as Swiss-American company Energy Vault targets a business combination with special purpose acquisition company (SPAC) Novus Capital Corporation II. The transaction is expected to close during this quarter and the combined company, to be named Energy Vault Holdings, will list on the New York Stock Exchange (NYSE) as a result. Energy Vault said in October as it announced the intended merger that it has private investment in public...
  • Physicists crack unsolvable three-body problem using drunkard's walk ... It has plagued scientists since the days of Isaac Newton.

    01/04/2022 12:20:44 PM PST · by Red Badger · 83 replies
    https://www.livescience.com ^ | January 4, 2022 | By Ashley Hamer
    A physics problem that has plagued science since the days of Isaac Newton is closer to being solved, say a pair of Israeli researchers. The duo used "the drunkard's walk" to calculate the outcome of a cosmic dance between three massive objects, or the so-called three-body problem. For physicists, predicting the motion of two massive objects, like a pair of stars, is a piece of cake. But when a third object enters the picture, the problem becomes unsolvable. That's because when two massive objects get close to each other, their gravitational attraction influences the paths they take in a way...
  • Uncovering the secrets of ultra-low frequency gravitational waves

    10/18/2021 8:02:11 PM PDT · by BenLurkin · 16 replies
    phys.org ^ | October 18, 2021 | by University of Birmingham
    Gravitational waves—ripples in the fabric of Einstein's spacetime—that cross the universe at the speed of light have all sorts of wavelengths, or frequencies. Scientists have not yet managed to detect gravitational waves at extremely low 'nanohertz' frequencies, but new approaches currently being explored are expected to confirm the first low frequency signals quite soon. The main method uses radio telescopes to detect gravitational waves using pulsars—exotic, dead stars, that send out pulses of radio waves with extraordinary regularity. Researchers at the NANOGrav collaboration, for example, use pulsars to time to exquisite precision the rotation periods of a network, or array,...
  • This Physicist Discovered an Escape From Hawking’s Black Hole Paradox

    08/25/2021 10:56:56 AM PDT · by Red Badger · 50 replies
    https://www.quantamagazine.org ^ | August 23, 2021 | Natalie Wolchover
    The five-decade-old paradox — long thought key to linking quantum theory with Einstein’s theory of gravity — is falling to a new generation of thinkers. Netta Engelhardt is leading the way. =============================================================================== In 1974, Stephen Hawking calculated that black holes’ secrets die with them. Random quantum jitter on the spherical outer boundary, or “event horizon,” of a black hole will cause the hole to radiate particles and slowly shrink to nothing. Any record of the star whose violent contraction formed the black hole — and whatever else got swallowed up after — then seemed to be permanently lost. Hawking’s calculation...
  • Fantastic Visualization Shows What Would Happen if you Dropped a Ball Across the Solar System

    07/20/2021 7:50:23 AM PDT · by Red Badger · 32 replies
    www.universetoday.com ^ | JULY 19, 2021 | | BY NANCY ATKINSON
    Summertime means it’s time to play ball! But what would it be like to play ball on various locations across our Solar System? Planetary scientist Dr. James O’Donoghue has put together a fun animation of how quickly an object falls on to the surfaces of places like the Sun, Earth, Ceres, Jupiter, the Moon, and Pluto. The animation shows a ball dropping from 1 kilometer to the surface of each object, assuming no air resistance. You can compare, for example, that it takes 2.7 seconds for a ball to drop that distance on the Sun, while it takes 14.3 seconds...
  • Protester Plummets After Climbing Bank Wall in Midtown

    04/02/2021 8:25:14 PM PDT · by grundle · 93 replies
    https://www.youtube.com/watch?v=9aVrly1bSq0
  • 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
    https://scitechdaily.com ^ | 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
    https://scitechdaily.com ^ | 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
    www.sciencealert.com ^ | 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
    Space.com ^ | 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
    Phys.org ^ | 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
    phys.org ^ | 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
    dailymail.co.uk ^ | 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 ...