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Latest Tests of general relativity Stories

2013-07-29 16:23:33

Physicists use dysprosium to put bounds on maximum speed of electrons Albert Einstein's assertion that there's an ultimate speed limit – the speed of light – has withstood countless tests over the past 100 years, but that didn't stop University of California, Berkeley, postdoc Michael Hohensee and graduate student Nathan Leefer from checking whether some particles break this law. The team's first attempt to test this fundamental tenet of the special...

Using Black Hole Disks And Jets To Explore The Limits Of Spacetime
2013-02-22 10:37:51

Watch the video "Magneto-Spin Alignment Effect Movie (Black Hole Jet)" April Flowers for redOrbit.com - Your Universe Online Black holes are voracious monsters at the center of galaxies that shape the growth and death of the stars around them with their tremendous gravitational pull and explosive ejections of energy.  "Over its lifetime, a black hole can release more energy than all the stars in a galaxy combined," explains“¯Roger Blandford, Stanford professor,...

Gravitational Waves Are The 'Sounds Of The Universe'
2011-10-03 09:19:36

Einstein wrote about them, and we're still looking for them -- gravitational waves, which are small ripples in the fabric of space-time, that many consider to be the sounds of our universe. Just as sound complements vision in our daily life, gravitational waves will complement our view of the universe taken by standard telescopes. Albert Einstein predicted gravitational waves in 1918. Today, almost 100 years later, advanced gravitational wave detectors are being constructed in the US,...

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2011-05-05 05:50:00

NASA's Gravity Probe B (GP-B) has produced astonishing new confirmation of two key predictions derived from Albert Einstein's general theory of relativity, which the spacecraft was designed to assess. The satellite's observations show the Earth is very slightly warping time and space, and even pulling them around with it.  The findings validate Einstein's prediction, devised nearly a century ago, that large objects in the universe distort space and time with the force of their gravity,...

2011-05-04 12:00:00

WASHINGTON, May 4, 2011 /PRNewswire-USNewswire/ -- NASA's Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein's general theory of relativity, which the spacecraft was designed to test. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) The experiment, launched in 2004, used four ultra-precise gyroscopes to measure the hypothesized geodetic effect, the warping of space and time around a gravitational body, and frame-dragging, the...

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2010-05-21 08:01:39

Advancing into the next frontier in astrophysics and cosmology depends on our ability to detect the presence of a particular type of wave in space, a primordial gravitational wave. Much like ripples moving across a pond, these waves stretch the fabric of space itself as they pass by. If detected, these weak and elusive waves could provide an unprecedented view of the earliest moments of our universe. In an article appearing in the May 21 issue of Science, Arizona State University theoretical...

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2010-03-11 07:40:00

Sloan Digital Survey data provide test that rules out alternative theories of gravity An analysis of more than 70,000 galaxies by University of California, Berkeley, University of Zurich and Princeton University physicists demonstrates that the universe "“ at least up to a distance of 3.5 billion light years from Earth "“ plays by the rules set out 95 years ago by Albert Einstein in his General Theory of Relativity. By calculating the clustering of these galaxies, which stretch...

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2009-09-01 13:20:00

Scientists using a continent-wide array of radio telescopes have made an extremely precise measurement of the curvature of space caused by the Sun's gravity, and their technique promises a major contribution to a frontier area of basic physics."Measuring the curvature of space caused by gravity is one of the most sensitive ways to learn how Einstein's theory of General Relativity relates to quantum physics. Uniting gravity theory with quantum theory is a major goal of 21st-Century physics,...

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2009-07-21 08:23:15

Even Albert Einstein might have been impressed. His theory of general relativity, which describes how the gravity of a massive object, such as a star, can curve space and time, has been successfully used to predict such astronomical observations as the bending of starlight by the sun, small shifts in the orbit of the planet Mercury and the phenomenon known as gravitational lensing. Now, however, it may soon be possible to study the effects of general relativity in bench-top laboratory...

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2009-02-24 09:32:07

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 completely characterized by only two numbers "” mass and spin "” and is sometimes described by the aphorism "black holes have no hair.'' A particle orbiting a rotating black hole always conserves its energy and angular momentum, but otherwise traces a complicated twisting rosette pattern with no...


Word of the Day
mallemaroking
  • Nautical, the visiting and carousing of sailors in the Greenland ships.
This word is apparently from a confusion of two similar Dutch words: 'mallemerok,' a foolish woman, and 'mallemok,' a name for some persons among the crew of a whaling vessel.