Latest General relativity Stories

2005-04-13 18:50:14

Helsinki -- The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. But we rarely think about the fundamental nature of time. Time is passing non-stop, and we follow it with clocks and calendars. Yet we cannot study it with a microscope or experiment with it. And it still keeps passing. We just cannot say what exactly happens when time passes. Time is represented through change, such as the circular motion of the moon around...

2005-04-06 08:04:12

RAS -- For almost 100 years, scientists have been searching for direct evidence of the existence of gravity waves "“ faint ripples in the fabric of spacetime predicted in Albert Einstein's theory of General Relativity. Today, the hunt for gravity waves has become a worldwide effort involving hundreds of scientists. A number of large, ground-based facilities have been developed in Europe, the United States and Japan, but the most sophisticated search of all will soon take place in...

2005-03-28 09:10:00

By measuring the shape of space with exquisite precision, NASA's Gravity Probe B aims to confirm Einstein's theory of relativity ... or provide the first evidence against it. Science@NASA -- This year marks the 100th anniversary of a revolution in our notions of space and time. Before 1905, when Albert Einstein published his theory of special relativity, most people believed that space and time were as Sir Isaac Newton described them back in the 17th century: Space was the fixed, unchanging...

2005-03-11 07:20:00

Penn State -- Black holes have a reputation for voraciously eating everything in their immediate neighborhood, but these large gravity wells also affect electromagnetic radiation and may hinder our ability to ever locate the center of the universe, according to an international research team. "Any attempt to discover what was happening a long time ago at the beginning of our universe must take into account what gravitationally assisted negative refraction does to the radiation being viewed,"...

2005-03-05 05:35:00

NASA -- Thirty-five years after Moon-walking astronauts placed special reflectors on the lunar surface, scientists have used these devices to test Albert Einstein's general theory of relativity to unprecedented accuracy. The findings, which also confirm theories from Galileo Galilei and Isaac Newton, may help to explain physical laws of the universe and benefit future space missions. "Our research with the Lunar Laser Ranging experiment probes the equivalence principle, a foundation of...

2005-02-24 12:15:00

Using the X-ray Satellite XMM-Newton researchers measure velocities near the speed of light in the vicinity of cosmic mass monsters Max-Planck -- European astronomers succeeded for the first time to confirm the signatures predicted near Black Holes by Albert Einstein's theory of Relativity in the light of the cosmic X-ray background. The group of scientists led by Gnther Hasinger, director at the Max-Planck-Institute for extraterrestrial Physics in Garching near Munich could identify the...

2005-01-11 14:20:00

San Diego, CA -- Astronomers Jon Miller (Harvard-Smithsonian Center for Astrophysics) and Jeroen Homan (MIT) have seen evidence of hot iron gas riding a ripple in spacetime around a black hole. This spacetime wave, if confirmed, would represent a new phenomenon that goes beyond Einstein's general relativity. These observations confirm one important theory about how a black hole's extreme gravity can stretch light. The data also paint an intriguing image of how a spinning black hole can drag...

2005-01-11 07:16:21

PARIS (AFP) -- He wrote three ground-breaking works in a "miracle year" a century ago and died 50 years ago this April. Now, in 2005, Einstein has been recalled to duty -- this time, as poster boy for a UN-backed effort to resuscitate physics, a discipline mired in a worrying decline. The campaign gets off to a ceremonial start in Paris on Friday, but already Einstein's name and iconic visage are starting to swirl around the globe like atomic particles in Brownian motion. The reason for...

2005-01-10 16:15:00

ESA --  Using a "Ëœradar-gun' technique, typical of police speed-traps, scientists have clocked three separate clumps of hot iron gas whipping around a black hole at 30 000 kilometres per second, about a tenth of the speed of light. The observation, made with ESA's XMM-Newton observatory, marks the first time scientists could trace individual blobs of shredded matter on a complete journey around a black hole. This provides a crucial measurement that has long been missing...

2004-11-27 08:00:00

A key prediction of Albert Einstein's general theory of relativity has been confirmed by an experiment showing that the Earth's rotation drags the surrounding fabric of space-time along with it. The phenomenon, known as frame-dragging, was one of the last untested predictions of general relativity. A NASA satellite, Gravity Probe B, was launched this year to test the same effect. "Frame-dragging is like what happens if a bowling ball spins in a thick fluid, such as molasses," said Errico C....

Latest General relativity Reference Libraries

Nature Physics
2012-05-18 15:50:42

Nature Physics is a peer-reviewed scientific journal established in 2005 and published monthly by the Nature Publishing Group. The editor-in-chief is Alison Wright, who is a full-time professional editor employed by the journal. The journal publishes original research, letters, full-length articles, review articles, news, views, physics research highlights, commentaries, book reviews, and correspondence. The main focus is pure and applied physics research, encompassing core physics...

General Relativity and Gravitation
2012-04-29 19:54:56

General Relativity and Gravitation is a peer-reviewed scientific journal published monthly since its establishment in 1970. It is published by Springer on behalf of the International Society on General Relativity and Gravitation. G.F.R. Ellis and H. Nicolai are the editors-in-chief. The journal covers modern gravitational physics, encompassing all theoretical and experimental aspects of general relativity and gravitation. The journal’s main goals include public outreach through teaching...

Foundations of Physics
2012-04-29 19:30:54

Foundations of Physics is a monthly-published journal devoted to the conceptual bases and fundamental theories of modern physics and cosmology, emphasizing the logical, methodological, and philosophical premises of modern physical theories and procedures. The journal publishes results and observations based on fundamental questions from all major fields of physics: quantum mechanics, quantum field theory, special relativity, general relativity, string theory, M-theory, cosmology,...

2004-10-19 04:45:44

String Theory -- A string theory is a physical model whose fundamental building blocks are extended objects (strings, membranes and higher-dimensional objects) rather than points. String theories are able to avoid problems, such as infinite energy density, associated with the presence of mathematical points in a physical theory. The term 'string theory' properly refers to both the 26 dimensional bosonic string theories and to the 10 dimensional superstring theories discovered by...

2004-10-19 04:45:42

Spacetime -- In special relativity and general relativity, time and three-dimensional space are treated together as a single four-dimensional manifold called spacetime (alternatively, space-time; see below). A point in spacetime may be referred to as an event. Each event has four coordinates (t, x, y, z). Just as the x, y, z coordinates of a point depend on the axes one is using, so distances and time intervals, invariant in Newtonian physics, may depend on the reference frame of an...

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Word of the Day
  • A landsman who is making his first voyage at sea; a novice who enters naval service from rural life.
According to the OED, a grass-comber is also 'a sailor's term for one who has been a farm-labourer.'