Gravitational field
hideA gravitational field is a model used within physics to explain how gravity exists in the universe. In its original concept, gravity was a force between point masses. Following Newton, Laplace attempted to model gravity as some kind of radiation field or fluid, and since the 19th century explanations for gravity have usually been sought in terms of a field model, rather than a point attraction.
In a field model, rather than two particles attracting each other, the particles distort spacetime via their mass, and this distortion is what is perceived subjectively as a "force". In fact there is no force in such a model, rather matter is simply responding to the curvature of spacetime itself.
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News tagged with gravitational field
Chinese scientists create metamaterial black hole
Oct 16, 2009 |
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(PhysOrg.com) -- Two physicists in China have used metamaterials to create the first artificial electromagnetic black hole. The scientists, Qiang Cheng and Tie Jun Cui from the Southeast University in Nanjing, ...
German scientists produce first Bose-Einstein condensate with calcium atoms
Sep 22, 2009 |
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Physicists at the Physikalisch-Technische Bundesanstalt (Germany) have succeeded in producing a Bose-Einstein condensate from the alkaline earth element calcium. The use of alkaline earth atoms creates new ...
GEMS mission to explore the polarized universe
Space & Earth / Space Exploration
Aug 04, 2009 |
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An exciting new astrophysics mission led by NASA's Goddard Space Flight Center in Greenbelt, Md., will provide a revolutionary window into the universe. Named the Gravity and Extreme Magnetism Small Explorer ...
Jupiter, solar system's 'big bully,' takes a punch
Space & Earth / Space Exploration
Jul 30, 2009 |
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(PhysOrg.com) -- Astronomers have been turning the world's most powerful telescopes toward Jupiter, the solar system's largest planet, ever since Australian amateur astronomer Anthony Wesley discovered a new ...
Crashing comets not likely the cause of Earth's mass extinctions: new research
Space & Earth / Space Exploration
Jul 30, 2009 |
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(PhysOrg.com) -- Scientists have debated how many mass extinction events in Earth's history were triggered by a space body crashing into the planet's surface. Most agree that an asteroid collision 65 million ...
New class of black holes discovered
Jul 01, 2009 |
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A new class of black hole, more than 500 times the mass of the Sun, has been discovered by an international team of astronomers.
XMM-Newton takes astronomers to a black hole's edge
May 27, 2009 |
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(PhysOrg.com) -- Using new data from ESA's XMM-Newton spaceborne observatory, astronomers have probed closer than ever to a supermassive black hole lying deep at the core of a distant active galaxy.
LIDAR system offers peerless precision in remote measurements
May 24, 2009 |
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By combining the best of two different distance measurement approaches with a super-accurate technology called an optical frequency comb, researchers at the National Institute of Standards and Technology have built a laser ...
QUIET team to deploy new gravity-wave probe in June
May 15, 2009 |
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A tiny fraction of a second following the big bang, the universe allegedly experienced the most inflationary period it has ever known.
Subterranean oceans on Saturn's moon Titan
Space & Earth / Space Exploration
Apr 06, 2009 |
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(PhysOrg.com) -- Saturn's largest moon, Titan, may have a subterranean ocean of hydrocarbons and some topsy-turvy topography in which the summits of its mountains lie lower than its average surface elevation, ...
GOCE launch: Mapping the Earth’s gravity as never before
Space & Earth / Space Exploration
Mar 09, 2009 |
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(PhysOrg.com) -- ESA is about to launch the most sophisticated of Earth Observation satellites to investigate the Earth’s gravitational field with unprecedented resolution and accuracy.
A Newtonian system that mimics the baldness of rotating black holes
Feb 23, 2009 |
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(PhysOrg.com) -- The rotating black hole has been described as one of nature's most perfect objects. As described by the Kerr solution of Einstein's gravitational field equations, its spacetime geometry is ...
