Einstein's Theories of Relativity and GravitationEinstein's theory of relativity confounded and excited both professional and amateur scientists with its explanation of the intricacies of how the world and the universe truly work, rather than how people wished or believed they worked. His view of relativity dismantled Newton's theory of space and time as absolutes, adding the concept of curved spacetime, which deals with the velocity of motion. Einstein explains his theory of physics in a way that was designed not only for scientists with a knowledge of the complicated math involved but for the general reader as well. 
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Brings a foreign subject matter to most people and tries to make ti understadable and readable. I was able to follow the general theory and i think this book is for the nonphysics general public. But it is a bit dated in the terms. Mainly the fact that ether is still in this book is annoying
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Read this book if you want to go to sleep. Seriously though i was falling asleep reading this boring book. this dude describes these stupid essays written in 1920 like Tom Clancy describes how a bullet got shot and hit nothing in 3 chapters.
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absolute motion acceleration actually assumption axioms clock concepts contest continuum curvature curved deﬁne deﬁnition direction distance earth Einstein Einstein's theory electromagnetic elements energy equal equations essays ether Euclid Euclidean geometry Euclidean space existence experiment expression external fact ﬁeld of force ﬁgure ﬁnal ﬁnd ﬁrst ﬁxed ﬂash ﬂat ﬂoor ﬂy four dimensions fourdimensional fourspace fundamental geodesic gravitational ﬁeld hypothesis ideas inﬂuence law of gravitation laws of nature length mass mathematical mathematician matter means measure measure space ment MichelsonMorley experiment miles per second mirror moving Newton's law nonEuclidean nonEuclidean geometry objects observer parallel postulate particle path perihelion phenomena physical position possible postulate principle of relativity prize properties reality reference system reﬂected regard rela relative motion rotation scientiﬁc signiﬁcance space spacetime Special Theory speed statement straight line supposed surface theory of relativity things timespace tion track uniform motion universe velocity of light waves
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Page 70  The second is that the velocity of light in free space appears the same to all observers regardless of the relative motion of the source of light and the observer.
Page 288  K' provided that K and K' are in uniform movement of translation." The second principle on which the special relativity theory rests is that of the constancy of the velocity of light in a vacuum. Light in a vacuum has a definite and constant velocity, independent of the velocity of its source. Physicists owe their confidence in this proposition to the MaxwellLorentz theory of electrodynamics.
Page 107  Getting along without drugs may seem as preposterous as did the theory that the earth rotates on its axis and revolves around the sun, to the ancient astronomers.
Page 35  ... absolute, true, and mathematical, time flows in virtue of its own nature, uniformly, and without reference to any external object; absolute space, by virtue of its own nature, and without reference to any external object, always remains the same and is immovable.
Page 228  ... principle of relativity states that those relations, and those alone, which persist unchanged in form for all possible spacetime reference frameworks are the inherent laws of nature. To find such relations Einstein has applied a mathematical method of great power — the calculus of tensors — with extraordinary success. This calculus threshes out the laws of nature, separating the observer's eccentricities from what is independent of him, with the superb efficiency of a modern harvester.
Page 223  To exhibit this, we must recall a familiar proposition of geometry: the square on the longest side of a rightangled triangle is equal to the sum of the squares on the other two sides.
Page 248  The laws of physical phenomena, or rather the mathematical expressions for these laws, are covariant (unchanged in form) when we apply the Lorentz transformation to them. The deductions from the MichelsonMorley experiment now seem to have reached their ultimate conclusion. One discordant fact in this new theory remained, however. That same precession of the perihelion of Mercury which had first lead Einstein to his theory remained unsettled. When the new approximations were applied to the formula...
Page 47  ... position of an object can only be determined with reference to other objects: in order to describe the place of a material thing we must, for example state its distances from other things. If there were no such bodies of reference, the words "position in space" would have no definite meaning for us.]2* [The number of such external bodies of reference which it is necessary to cite in order to define completely the position of a given body in space depends upon the character of the space dealt...
Page 206  They exhibit the difference by acquiring an acceleration; and we explain the acceleration by alleging the existence of a force, which we call the force of gravitation. But their motions can in fact be perfectly predicted if we know the geometry of the space through which they are traveling. The predictions so based have in fact proved more accurate than those based on the law of gravitation. SPACE, TIME AND GRAVITATION AN OUTLINE OF EINSTEIN'S THEORY OF GENERAL RELATIVITY BY W. DE SITTER PROFESSOR...
Page 28  ... verified. If new facts are discovered that are not in agreement with one of these generalized statements, the assumptions on which the latter is based are examined, those which are not in accordance with the new facts are given up, and the statement is modified so as to include the new facts.]10 [And if one remembers that the laws of physics were formerly based on a range of observations much narrower than at present available, it seems natural that in the light of this widening knowledge one...