Question on a forum

Einstein's relativity theory? can somebody answer my question, I dont understand.

Why is it that if something goes really fast, it looks smaller?

Why is it that the faster you go, the more time slows down? So if I went for a jog, my clock will tick slower than if I left it?

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General Theory of Relativity

Posterior 1905, Einstein advanced working in full three of his works in the 1905 papers. He assembled prominent contributions to the quantum theory, while increasingly he sought to extend the special theory of relativity to phenomena involving increasing speed. The key to an elaboration emerged in 1907 with the principle of equivalence, in which gravitational speeding up was owned a priori indistinguishable from acceleration caused by mechanical forces; gravitational mass was therefore identical regardless of inertial mass. Einstein elevated this identity, which is implicit in the work of Isaac Newton, to a guiding principle in his attempts to explain both electromagnetic and gravitational quickening according to one set of physical laws. In 1907 he proposed that if mass were equivalent to energy, then the principle of equivalence required that gravitational mass would interact regardless of the apparent mass of electromagnetic radiation, which includes light. By 1911, Einstein was able to expand preliminary predictions approximately how a ray of light from a distant star, passing near the Sun, would exist to be attracted, or bent slightly, in the direction of the Sun's mass. At the same time, light radiated from the Sun would interact regardless of the Sun's mass, resulting in a slight change toward the infrared end of the Sun's optical spectrum. At this juncture Einstein moreover knew that any new theory of gravitation would benefit from to account for a small but persistent anomaly in the perihelion motion of the planet Mercury.

Theory of Relativity Passes Another Test

Einstein's theory of General Relativity has been around for 93 years, also it barely keeps hanging in there. Despite advances in technology has come the ability to put the theory under some scrutiny. Earlier, taking advantage of a unique cosmic coincidence, inclusive of a pretty darn good telescope, astronomers looked at the strong gravity from a pair of superdense neutron celebrities furthermore measured an actualize predicted by General Relativity. The theory came through regardless of flying colors.
Einstein's 1915 theory predicted that in a close system of two very massive objects, such as neutron stars, one object's gravitational tug, also an bring off of its spinning around its axis, should cause the spin axis of the other to wobble, or precess. Studies of other pulsars in binary systems had indicated that such wobbling occurred, however could not make precise measurements of the amount of wobbling.
"Measuring the amount of wobbling is what tests the details of Einstein's theory together with stocks a benchmark that any alternative gravitational theories must meet," said Scott Ransom of the National Radio Astronomy Observatory.
The astronomers applied the Country-wide Science Foundation's Robert C. Byrd Green Bank Telescope (GBT) to make a four-year study of a double-star system unlike any other known in the Universe. The system is a pair of neutron stars, both of which are seen as pulsars that emit lighthouse-like beams of radio waves.
"Of about 1700 known pulsars, this is the only case where two pulsars are in orbit around each other," said Rene Breton, a graduate student at McGill University in Montreal, Canada. As well as, the celebrities' orbital plane is aligned just about perfectly despite their line of sight to the Earth, so that one passes below a doughnut-shaped region of ionized gas surrounding the other, eclipsing the signal from the pulsar in postliminary.
Animation of double pulsar system
The eclipses allowed the astronomers to pin down the geometry of the double-pulsar system including track changes in the orientation of the spin axis of one of them. As one pulsar's spin axis slowly moved, the pattern of signal blockages as the other passed behind it along changed. The signal from the pulsar in ensuign is absorbed by the ionized gas in the other's magnetosphere.
The pair of pulsars studied despite the GBT is almost 1700 light-years from Earth. The average distance between the two is only approximately twice the distance from the Earth to the Moon. The two orbit each other in merely under two along with a half hours.
"A system like this, despite two very massive objects very close to each other, is precisely the kind of extreme 'cosmic laboratory' needed to test Einstein's prediction," said Victoria Kaspi, leader of McGill University's Pulsar Group.
Theories of gravity don't differ significantly in "ordinary" regions of space such as our own Solar System. In regions of extremely strong gravity fields, such as near a pair of close, massive objects, while, differences are expected to motion picture up. In the binary-pulsar study, General Relativity "passed the test" provided by such an extreme environment, the scientists said.
"It's not quite right to say that we take advantage of today 'proven' General Relativity," Breton said. "Yet, so far, Einstein's theory has passed total the tests that have been conducted, over and above ours."

Einstein's relativity theory probed

Einstein's theory of general relativity, significant to our acceptation of the cosmos, is approximately to be put to a rigorous test, using a satellite due to be launched early this week.

The NASA mission is due to be launched from Vandenberg Whiff Force Base in California in the early hours of Tuesday morning (03:01 Australian Eastern Standard Time, or 17:01 Universal Time on Monday).

The US$700 million Gravity Probe B satellite will attempt to verify two very subtle physical effects of the Earth along its surrounds that Einstein predicted more than 40 years ago.

Einstein regarded space along with time as interwoven as well as inseparable, hence the term 'space-time'.

One of his predictions is that spinning a massive object like the Sun or the Earth would distort space-time by dragging it around like a piece of fabric.

Einstein's Relativity Theory Proven With The 'Lead' Of A Pencil

Until now it was only possible to test the theory by building expensive machinery or by studying stars in distant galaxies, but a team of British, Russian and Dutch scientists has now proven it can be done in the lab using an ultra-thin material called Graphene.

The group, led by Professor Andre Geim of the School of Physics and Astronomy, discovered the one atom thick material last year. Graphene is created by extracting one atom thick slivers of graphite via a process similar to that of tracing with a pencil.

Professor Geim, said: "To understand implications of the relativity theory, researchers often have to go considerable lengths, but our work shows that it is possible to set up direct experiments to test relativistic ideas. In theory, this will speed up possible discoveries and probably save billions of pounds now that tests can be set up using Graphene and relatively inexpensive laboratory equipment."
In a paper published in Nature (November 10, 2005), the team describes how electric charges in Graphene appear to behave like relativistic particles with no mass (zero rest mass). The new particles are called massless Dirac fermions and are described by Einstein's relativity theory (so-called the Dirac equation).

The team also reports several new relativistic effects. They have shown that massless Dirac fermions are pulled by magnetic fields in such a manner that they gain a dynamic (motion) mass described by the famous Einstein's equation E=mc2. This is similar to the case of photons (particles of light) that also have no mass but can still feel the gravitational pull of the Sun due their dynamic mass described by the same equation.

Dr Kostya Novoselov, a key investigator in this research, added: "The integer and fractional quantum Hall effects are two of the most remarkable discoveries of the late 20th century. It is not easy to explain their significance but both discoveries led to Nobel prizes. One can probably appreciate the importance of our present work in terms of fundamental physics, if I mention that one of the phenomena we report is a new, relativistic type of the quantum Hall effect."

The Universe Expands Faster Every Minute

Scientists now possess the most accurate value of said parameter, which implies that equations of general relativity theory (Albert Einstein) on all distances � from planets radiuses to the observed part of the Universe. Russian scientists are now in promising collaboration with international colleagues, and their work is aimed at creating an orbital X-ray observatory 'Spectra-roentgen-gamma' and launching it to the orbit in 2012.

The observatory will study the sky and is expected to detect about 100 thousand new galactic clusters (e.g. all massive clusters in our Universe), about 3 million of nuclei of active galaxies (superheavy black holes) and 2 million of coronally active stars. The results will give exact data on how fast the Universe structure grows, and then help correctly determine dark energy state equation.

Einstein's physics on violin

Physics department at the University of Oxford will deliver a lecture on Einstein's contribution to physics, including his famous Theory of Relativity.

Violinist Jack Liebeck will join Professor Foster on stage at various points to provide musical analogies to some of the points raised by the lecture.

The lecture will also look at how technological developments in Switzerland may have influenced Einstein's work, as well as the latest updates on the Large Hadron Collider at CERN in Geneva.

The lecture will take place at Dillington House near Ilminster at 2.30pm on Sunday, February 8. Tickets cost £14, which includes tea and cake, contact the box office on 01460-52427 for details.

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Michael Duff: Einstein didn't explain everything. We need a...

Quantum theory deals with the very small: atoms, subatomic particles and the forces between them. General relativity deals with the very large: stars, galaxies and gravity, the driving force of the cosmos as a whole. The dilemma is that on the microscopic scale, Einstein's theory fails to comply with the quantum rules that govern the behaviour of the elementary particles. On the macroscopic scale, black holes are threatening the very foundations of quantum mechanics. Something big has to give. This augurs a new scientific revolution.

Some believe that this revolution is already under way because of "superstrings". As their name suggests, superstrings are one-dimensional string-like objects. Just like violin strings, they can vibrate, and each mode of vibration, each note if you like, corresponds to a different elementary particle.

E=MC2: 103 years later, Einstein's proven right

In other words, energy and mass are equivalent, as Einstein proposed in his Special Theory of Relativity in 1905.

The e=mc2 formula shows that mass can be converted into energy, and energy can be converted into mass.

By showing how much energy would be released if a certain amount of mass were to be converted into energy, the equation has been used many times, most famously as the inspirational basis for building atomic weapons.

But resolving e-mc2 at the scale of sub-atomic particles -- in equations called quantum chromodynamics -- has been fiendishly difficult.

"Until now, this has been a hypothesis," France's National Centre for Scientific Research (CNRS) said proudly in a press release.

"It has now been corroborated for the first time."

For those keen to know more: the computations involve "envisioning space and time as part of a four-dimensional crystal lattice, with discrete points spaced along columns and rows." .