1,792
edits
Changes
Jump to navigation
Jump to search
Line 16:
Line 16: − + − + − − Robert Massey of the Royal Astronomical Society said: 'From the most esoteric aspects of time dilation through to the beautiful and simple equation, E=mc², the vast bulk of Einstein's ideas about the universe are standing up to the test of time,' Line 32:
Line 30: −
Gravity Probe B was a flop
Arthur Eddington popularized General Relativity by publishing an explanation of it and by attempting to prove the theory experimentally in a dramatic test. Eddington embarked on a highly publicized trip into the Atlantic Ocean off Africa in order to observe the bending of [[star]]light passing nearby the [[Sun]] during the total [[solar eclipse]] of May 29, 1919. Eddington returned with a declaration that he had proven Einstein's theory of [[General Relativity]], making Einstein extremely famous<ref>On November 8, 1919, for example, the ''London Times'' had an article headlined: "The Revolution In Science/Einstein Versus Newton." Two days later, ''The New York Times''' headlines read: "Lights All Askew In The Heavens/Men Of Science More Or Less Agog Over Results Of Eclipse Observations/Einstein Theory Triumphs." [http://www.pbs.org/wgbh/nova/einstein/relativity/]</ref>, when in fact he had selectively used data to attain this result. No Nobel Prize was given for relativity.
Arthur Eddington popularized General Relativity by publishing an explanation of it and by attempting to prove the theory experimentally in a dramatic test. Eddington embarked on a highly publicized trip into the Atlantic Ocean off Africa in order to observe the bending of [[star]]light passing nearby the [[Sun]] during the total [[solar eclipse]] of May 29, 1919. Eddington returned with a declaration that he had proven Einstein's theory of [[General Relativity]], making Einstein extremely famous<ref>On November 8, 1919, for example, the ''London Times'' had an article headlined: "The Revolution In Science/Einstein Versus Newton." Two days later, ''The New York Times''' headlines read: "Lights All Askew In The Heavens/Men Of Science More Or Less Agog Over Results Of Eclipse Observations/Einstein Theory Triumphs." [http://www.pbs.org/wgbh/nova/einstein/relativity/]</ref>, when in fact he had selectively used data to attain this result. No Nobel Prize was given for relativity.
In April 2007, NASA reported early results from their satellite Gravity Probe B, confirming 'to a precision of better than 1 per cent' Einstein's assertion that large objects such as the Earth distort the fabric of space and time.<ref> http://observer.guardian.co.uk/uk_news/story/0,,2057529,00.html</ref> The Gravity Probe B project, a joint mission between NASA and Stanford University, used the most precise gyroscopes ever manufactured to detect minute distortions in the fabric of the universe.
In April 2004, NASA launcheded the satellite Gravity Probe B to test general relativity. The main purpose was to test relativistic frame dragging, but the results have been inconclusive.
Einstein compared the effects of large objects on space and time to the way that a large ball placed on a sheet of rubber stretches the material and causes it to sag, and drew the analogy with the way stars and planets warp space-time. A smaller ball rolling along the sagging fabric will be drawn towards the larger ball, in the same way that the Earth is drawn towards the sun, but will not fall into it as long as it continues to move at sufficient speed. This was a change in thinking from the Newtonian cosmos, in which gravity was viewed purely as an attractive force between bodies.
Einstein compared the effects of large objects on space and time to the way that a large ball placed on a sheet of rubber stretches the material and causes it to sag, and drew the analogy with the way stars and planets warp space-time. A smaller ball rolling along the sagging fabric will be drawn towards the larger ball, in the same way that the Earth is drawn towards the sun, but will not fall into it as long as it continues to move at sufficient speed. This was a change in thinking from the Newtonian cosmos, in which gravity was viewed purely as an attractive force between bodies.
Einstein's statistical explanation of Brownian motion (the random movement of microscopic particles mixed in with pollen) helped confirm the atomic theory at a time when it was in doubt.<ref>[http://www.aip.org/history/einstein/essay-brownian.htm Einstein on Brownian Motion]</ref>
Einstein gave a statistical explanation of Brownian motion (the random movement of microscopic particles mixed in with pollen).<ref>http://www.aip.org/history/einstein/essay-brownian.htm Einstein on Brownian Motion]</ref>
===E=mc<sup>2</sup>===
===E=mc<sup>2</sup>===
===Cosmological Constant===
===Cosmological Constant===
Einstein revised his work on [[General Relativity]] to include a 'fudge-factor' which he termed the [[Cosmological Constant]]. He was trying to account for the apparent steady-state nature of the universe.
Einstein revised his work on [[General Relativity]] to include a 'fudge-factor' which he termed the [[Cosmological Constant]]. He was trying to account for the apparent steady-state nature of the universe.