EINSTEIN ALBERT (1879-1955).

Lot 75
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EINSTEIN ALBERT (1879-1955).
Signed letter, signed « A. Einstein », Princeton 4 April 1951, to Sam MOSKOWITZ, in Newark (New Jersey) ; 1 page in-4 format, typed letter, on letterhead of the Institute for Advanced Study, envelope; in English. Letter pertaining to the speed of light in the general theory of relativity. Sam MOSKOWITZ (1920-1997) was a historian and writor of science-fiction. He had interviewed Albert Einstein on this subject. Einstein responds to his question on the speed of light and the special and general theory of relativity, now well-defined. No object can travel at a speed faster than that of light. « According to the special theory of relativity the velocity of light relatively to an inertial system is something clearly defined and this speed of light is a limit for the speed of any object. According to general relativity there is still the well-defined velocity of light with respect to a local coordinate system. In this theory there do not exist privileged coordinate systems so that it makes no sense in general to speak about the speed of light with respect to the coordinate system. In special cases where natural choice of the coordinate system exists it is again possible to speak about “the velocity of light” but it is then not a constant but something which depends from the coordinates, f. i. from time ». Sold with carbon-copy of the typed letter written by Sam MOSKOWITZ, 28 March 1951 (2 p.) to Albert Einstein, asking him about the study published by Fred Hoyle entitled The Expanding Universe, which states that given the theory of relativity, an object can indeed travel faster than light. – A long signed autograph letter by the British astronomer Fred HOYLE (1915-2001) to Moskowitz, 27 March [1952] (3 p. in-4), explaining his hypotheses and commenting Einstein’s letter. – 2 brochures by Gerry de LA REE: Space Flight When ?... « Featuring the results of the 1946 Beowulf Poll » (1 f- 7 p. in-4), and Space Flight (February 1947
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