| 单词 | recessional velocity |
| 释义 | > as lemmasrecessional velocity 4. Astronomy. Relating to the movement of stars or galaxies away (from the earth); esp. in recessional velocity. ΚΠ 1925 Amer. Math. Monthly 32 223 Shapley was the first to point out and insist upon the significance of the systematic recessional motions of the spiral nebulæ. 1955 Sci. Monthly Oct. 168/2 Hubble conducted a series of investigations on the red-shift of the distant galaxies, an observation that is usually interpreted as evidence of recessional velocity. 1965 Philos. Sci. 32 21 In the theory, constant density is maintained as a result of the balance between the creation of matter and the recessional motion of the galaxies with respect to any given point in space. 2005 New Scientist (Nexis) 19 Nov. 36 An example..was Edwin Hubble's discovery in 1929 that the distance to galaxies are approximately proportional to their recessional velocities, a fact later used to support the notion that the universe is expanding. < as lemmas |
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