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    Time to overhaul Newton's theory of gravitation?
    Posted on Wednesday, October 31, 2007 @ 21:33:19 GMT by vlad

    Science Time to overhaul Newton's theory of gravitation? Galaxy cluster models cast doubt on dark matter

    For almost 75 years, astronomers have believed that the Universe has a large amount of unseen or ‘dark’ matter, thought to make up about five-sixths of the matter in the cosmos. With the conventional theory of gravitation, based on Newton’s ideas and refined by Einstein 92 years ago, dark matter helps to explain the motion of galaxies, and clusters of galaxies, on the largest scales.


    Now two Canadian researchers at the Perimeter Institute for Theoretical Physics suggest that the motion of galaxies in a distant cluster is more easily explained by a Modified Gravity (MOG) theory than by the presence of dark matter.

    Graduate student Joel Brownstein and his supervisor Professor John Moffat of the University of Waterloo present their results in a paper in the 21 November edition of Monthly Notices of the Royal Astronomical Society.

    The two scientists analysed images of the ‘Bullet Cluster’ of galaxies made using the Hubble Space Telescope, Chandra X-ray and Spitzer infrared observatories and the Magellan telescope in Chile. The Bullet Cluster consists of two merging clusters of galaxies and lies at a distance of over 3 billion light years in the direction of the southern constellation of Carina.

    This arsenal of instrumentation gave them maps of the 150 million degree hot gas between the galaxies and show the effect of gravitational lensing, where the gravity of an intervening object – here the Bullet Cluster - deflects the path of light emitted by a more distant galaxy.

    Previous studies suggested that the Bullet Cluster clearly demonstrates the presence of dark matter. But when Brownstein and Moffat compared the observed gravitational lensing and distribution of gas with that predicted using MOG theory, they found no evidence for this. In other words, it is more natural to explain the appearance of this cluster using a revised theory of gravitation than by including dark matter.

    MOG theory emerges from a generalization of relativity that eluded even Einstein, has been developed by Moffat for nearly thirty years and is now yielding astronomical and cosmological results. The theory has been used to successfully explain the movement of stars in over 100 galaxies and the motion of galaxies in more than 100 clusters. MOG theory may also explain the apparent anomalous deceleration of the Pioneer 10 and 11 space probes, launched in the early 1970s and now more than 12000 million km from the Sun.

    The two physicists are enthusiastic about their findings. Brownstein comments, ‘Using Modified Gravity (MOG) theory, the ‘normal’ matter in the Bullet Cluster is enough to account for the observed gravitational lensing effect. In time, better observations will lead to higher resolution pictures of the systems we are studying. Continuing the search for and then analysing other merging clusters of galaxies will help us decide whether dark matter or MOG theory offers the best explanation for the large scale structure of the Universe.’

    Professor Moffat adds, ‘If the multi-billion dollar laboratory experiments now underway succeed in directly detecting dark matter, then I will be happy to see Einsteinian and Newtonian gravity retained. However, if dark matter is not detected and we have to conclude that it does not exist, then Einstein and Newtonian gravity must be modified to fit the extensive amount of astronomical and cosmological data, such as the bullet cluster, that cannot otherwise be explained.’

    Source: Royal Astronomical Society
    Via: http://www.physorg.com/news113031879.html

     
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    "Time to overhaul Newton's theory of gravitation?" | Login/Create an Account | 2 comments | Search Discussion
    The comments are owned by the poster. We aren't responsible for their content.

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    Newton's Law of Gravity and the Rotationally Elastic Sponge (Score: 1)
    by FDT on Friday, November 02, 2007 @ 11:05:00 GMT
    (User Info | Send a Message)
    The magnetic field behaves like a rotationally elastic sponge in our solar system. It soaks up all the tangential force effects into the fine-grain vortices of the magnetic field.

    When we look farther out into space and see the spiral galaxies we know that this sponge effect may not always be so perfect.

    Newton's law of gravity almost certainly needs to be extended to include tangential forces for the general case where large scale vorticity becomes involved.

    See 'Gravitational Induction and the Gyroscopic Force' at,

    http://www.wbabin.net/science/tombe5.pdf [www.wbabin.net]

    Yours sincerely, David Tombe



    NASA Baffled by Unexplained Force Acting on Space Probes (Score: 1)
    by vlad on Sunday, March 02, 2008 @ 10:51:20 GMT
    (User Info | Send a Message) http://www.zpenergy.com
    by Charles O. Choi/ Special to SPACE.com

    Mysteriously, five spacecraft that flew past the Earth have each displayed unexpected anomalies in their motions.

    These newfound enigmas join the so-called " Pioneer anomaly [www.space.com]" as hints that unexplained forces may appear to act on spacecraft.

    A decade ago, after rigorous analyses, anomalies were seen with the identical Pioneer 10 and 11 spacecraft as they hurtled out of the solar system. Both seemed to experience a tiny but unexplained constant acceleration toward the sun...

    Full text: http://www.space.com/scienceastronomy/080229-spacecraft-anomaly.html [www.space.com]

    ------
    Jack Sarfatti writes: NASA may be baffled, but I am not.

    This is a zero point energy effect I suspect. I give a model calculation in my book Super Cosmos.

    That is, w = -1 isotropic zero point energy density (zpe) directly gravitates or antigravitates for positive and negative pressure respectively as dark matter in the former and dark energy in the latter...




     

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