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[[Image:600px-Albert Einstein Head.jpg|thumbnail|right|200px|

[[Image:600px-Albert Einstein Head.jpg|thumbnail|right|200px|

*"I do not share the crusading spirit of the professional [[Atheism|atheist]] whose fervor is mostly due to a painful act of liberation from the fetters of religious indoctrination received in youth. I prefer an attitude of humility corresponding to the weakness of our intellectual understanding of nature and of our own being." - Albert Einstein<ref name="Isaacson390">Isaacson, Walter (2008). [http://books.google.com/books?id=cdxWNE7NY6QC&pg=PT390 ''Einstein: His Life and Universe''] (New York: Simon and Schuster), p. 390.  Retrieved from GoogleBooks archive on February 19, 2015.</ref>]]

"I do not share the crusading spirit of the professional [[Atheism|atheist]] whose fervor is mostly due to a painful act of liberation from the fetters of religious indoctrination received in youth. I prefer an attitude of humility corresponding to the weakness of our intellectual understanding of nature and of our own being." - Albert Einstein<ref name="Isaacson390">Isaacson, Walter (2008). [http://books.google.com/books?id=cdxWNE7NY6QC&pg=PT390 ''Einstein: His Life and Universe''] (New York: Simon and Schuster), p. 390.  Retrieved from GoogleBooks archive on February 19, 2015.</ref>]]

'''Albert Einstein''' (1879-1955) was the most famous [[physicist]] of the 20th century, who however self-described himself to be “more of a [[philosopher]] than a physicist”.<ref name="Capria">{{cite book |author=Marco M. Capria, Aubert Daigneaut et al. |title=Physics Before and After Einstein |publisher=IOS Press |year=2005 |chapter=1. Albert Einstein: A Portrait |pages=12|isbn=1-58603-462-6 |url=www.dmi.unipg.it/~mamone/pubb/PBAE.pdf |quote=To his collaborator Leopold Infeld he said: “I am really more of a philosopher than a physicist” [17, p. 258].}}</ref> He was born in Ulm, in Württemberg, [[Germany]] in a [[Judaism|Jewish]] family. During his stay at the [[Switzerland|Swiss]] [[Patent and Trademark Office|Patent Office]] Einstein produced much of his remarkable work. In 1905 he obtained his [[Doctor|doctor's degree]]. He won the [[Nobel Prize]] for his work on the [[photoelectric effect]] in 1921.<ref>[http://nobelprize.org/nobel_prizes/physics/laureates/1921/ "The Nobel Prize in Physics, 1921"] (2014).  Nobelprize.org.  Retrieved on January 23, 2015.</ref> Einstein [[Immigration|immigrated]] to the [[United States of America|United States]] in the late 1930s to take the position of Professor of Theoretical Physics at [[Princeton University|Princeton]]; upon the urging of a colleague in physics, recommended that [[President of the United States of America|President]] [[Franklin Roosevelt|Franklin D. Roosevelt]] develop an [[atomic bomb]] project. <ref>Einstein, Albert (August 2, 1939).  [http://www.dannen.com/ae-fdr.html "Letter to F. D. Roosevelt, President of the United States"].  www.dannen.com.  Retrieved from "Leo Szilard Online:  Einstein's Letter to Roosevelt, August 2, 1939" on January 23, 2015.</ref> He later regretted this and became a passionate [[Pacifism|pacifist]].  In 1952, he was offered the Presidency of [[Israel]], but he turned it down. Einstein collaborated with Dr. Chaim Weizmann in establishing the [[Hebrew]] [[University]] of [[Jerusalem]]. Albert Einstein died on April 18, 1955 at Princeton, [[New Jersey]] at the age of 76.

'''Albert Einstein''' (1879-1955) was the most famous [[physicist]] of the 20th century, who however self-described himself to be “more of a [[philosopher]] than a physicist”.<ref name="Capria">{{cite book |author=Marco M. Capria, Aubert Daigneaut et al. |title=Physics Before and After Einstein |publisher=IOS Press |year=2005 |chapter=1. Albert Einstein: A Portrait |pages=12|isbn=1-58603-462-6 |url=www.dmi.unipg.it/~mamone/pubb/PBAE.pdf |quote=To his collaborator Leopold Infeld he said: “I am really more of a philosopher than a physicist” [17, p. 258].}}</ref> He was born in Ulm, in Württemberg, [[Germany]] in a [[Judaism|Jewish]] family. During his stay at the [[Switzerland|Swiss]] [[Patent and Trademark Office|Patent Office]] Einstein produced much of his remarkable work. In 1905 he obtained his [[Doctor|doctor's degree]]. He won the [[Nobel Prize]] for his work on the [[photoelectric effect]] in 1921.<ref>[http://nobelprize.org/nobel_prizes/physics/laureates/1921/ "The Nobel Prize in Physics, 1921"] (2014).  Nobelprize.org.  Retrieved on January 23, 2015.</ref> Einstein [[Immigration|immigrated]] to the [[United States of America|United States]] in the late 1930s to take the position of Professor of Theoretical Physics at [[Princeton University|Princeton]]; upon the urging of a colleague in physics, recommended that [[President of the United States of America|President]] [[Franklin Roosevelt|Franklin D. Roosevelt]] develop an [[atomic bomb]] project. <ref>Einstein, Albert (August 2, 1939).  [http://www.dannen.com/ae-fdr.html "Letter to F. D. Roosevelt, President of the United States"].  www.dannen.com.  Retrieved from "Leo Szilard Online:  Einstein's Letter to Roosevelt, August 2, 1939" on January 23, 2015.</ref> He later regretted this and became a passionate [[Pacifism|pacifist]].  In 1952, he was offered the Presidency of [[Israel]], but he turned it down. Einstein collaborated with Dr. Chaim Weizmann in establishing the [[Hebrew]] [[University]] of [[Jerusalem]]. Albert Einstein died on April 18, 1955 at Princeton, [[New Jersey]] at the age of 76.

[[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>Lightman, Alan (September 9, 1997).  [http://www.pbs.org/wgbh/nova/einstein/relativity/ "Relativity and the cosmos"].  PBS.org/WGBH/Nova.  Retrieved on January 24, 2015.  "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.'"</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>Lightman, Alan (September 9, 1997).  [http://www.pbs.org/wgbh/nova/einstein/relativity/ "Relativity and the cosmos"].  PBS.org/WGBH/Nova.  Retrieved on January 24, 2015.  "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.'"</ref>, when in fact he had selectively used data to attain this result.  No Nobel Prize was given for relativity.

In April 2004, NASA launched the satellite Gravity Probe B to test general relativity. The main purpose was to test relativistic frame dragging, but the results have been inconclusive.

In April 2004, NASA launched the satellite "Gravity Probe B" to test the ''geodetic precession'' and ''frame dragging'' effects of general relativity. The successful result of this test was announced on May 4, 2011<ref>http://prl.aps.org/accepted/L/ea070Y8dQ491d22a28828c95f660a57ac82e7d8c0</ref><ref>http://www.digitaljournal.com/article/306430</ref><ref>http://www.nap.edu/html/gpb/summary.html</ref><ref>http://www.sciencenews.org/view/generic/id/73870/title/Gravity_Probe_B_finally_pays_off_</ref><ref>http://www.nasa.gov/mission_pages/gpb/</ref><ref>http://einstein.stanford.edu/</ref><ref>http://spectrum.ieee.org/aerospace/space-flight/the-gravity-probe-b-bailout</ref><ref>http://www.engadget.com/2011/05/06/nasa-concludes-gravity-probe-b-space-time-experiment-proves-e/</ref>.

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.

''Main article:''[[Cosmological constant]]

''Main article:''[[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.

[[Edwin Hubble]], in whose name [[NASA]]'s famous [[Hubble Space Telescope]] is named, later convinced him otherwise.  At one point he had Einstein actually making direct observations alongside him, and Hubble's findings showed conclusively that the [[universe]] was indeed expanding, as predicted by certain solutions of GR's field equations in the absence of a cosmological constant.  Einstein recanted his original [[philosophy]], and accepted as true the notion of a changing universe having a definite [[begin]]ning.

 

[[Edwin Hubble]] (after whom [[NASA]]'s famous [[Hubble Space Telescope]] is named) later convinced him otherwise.  At one point he had Einstein actually making direct observations alongside him, and Hubble's findings showed conclusively that the [[universe]] was indeed expanding, as predicted by certain solutions of GR's field equations in the absence of a cosmological constant.  Einstein recanted his original position, and accepted as true the notion of a changing universe having a definite beginning.

He later said of his Cosmological Constant, "It was the biggest blunder of my life."

He later said of his Cosmological Constant, "It was the biggest blunder of my life."

An interesting end-note on this term: Principle investigators from [[Princeton University]] first published findings in 1998 apparently revealing an accelerating expansion for the universe<ref>[http://map.gsfc.nasa.gov/m_mm.html "WMAP produces new results"] (2013).  NASA/Goddard Space Flight Center/Wilkinson Microwave Anisotropy Probe website.  Retrieved on January 25, 2015.</ref>. Because this initially seemed like it might be a sort of 'anti-gravity' effect (similar in concept to Einstein's original notion), it briefly became quite popular for scientists to dub the phenomenon the 'Cosmological Constant' as well.  For more information, see: [[Dark Energy]].

An interesting end-note on this term: Principal investigators from [[Princeton University]] first published findings in 1998 apparently revealing an accelerating expansion for the universe<ref>[http://map.gsfc.nasa.gov/m_mm.html "WMAP produces new results"] (2013).  NASA/Goddard Space Flight Center/Wilkinson Microwave Anisotropy Probe website.  Retrieved on January 25, 2015.</ref>. Because this initially seemed like it might be a sort of 'anti-gravity' effect (similar in concept to Einstein's original notion), it briefly became quite popular for scientists to dub the phenomenon the 'Cosmological constant' as well.  For more information, see: [[Dark Energy]].

== Writings ==

== Writings ==