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单词 recession velocity
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recession velocity
h. Astronomy. The motion of a celestial object away from the earth, esp. that of an object outside our galaxy attributed to the expansion of the universe. Also attributive, esp. in recession velocity.Quot. 1841 refers to motion across the field of view (proper motion, rather than radial motion).
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1841 Trans. Amer. Philos. Soc. 7 117 I should, perhaps, attribute it to the same optical effect by which Sir J. Herschel..is inclined to explain the apparent recession of the nebula Orionis from the stars of the trapezium situate within it.]
1871 Proc. Royal Soc. 20 384 A recession of the nebula in the line of sight.
1935 Sci. News Let. 21 Dec. 390/1 A new outpost of the universe, a faint nebular galaxy of stars..with recession velocity of 50,000 miles per second was discovered at Mt. Wilson Observatory.
1964 Science 6 Nov. 804/2 Recession of galaxies is proportional to distance.
1981 E. R. Harrison Cosmology x. 215/2 The recession velocity increases with distance and at a certain distance equals the velocity of light.
1991 C. A. Ronan Nat. Hist. Universe 16/1 Light from double stars,..which orbit each other at significant speeds, is neither delayed nor advanced by the approach or recession of the source stars.
2004 Chaos, Solitons & Fractals 22 976 Some astronomers, such as Arp and Hoyle, believe that to connect the red shift to the recession is an error.
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