| 单词 |
mascon |
| 释义 |
mascon Astr.|ˈmæskɒn|
[f. mass concentration.]
One of the concentrations of denser material thought to exist under some lunar maria, discovered as a result of the variations they produce in the speed of an orbiting satellite; also, a similar region on another planet.
1968Muller & Sjogren in Science 16 Aug. 680/1 The Urey-Gilbert theory of lunar history has predicted such large-scale high-density mass concentrations below these maria, which, for convenience, we shall call mascons. 1969Times 22 Feb. 7/7 Exactly what the mascons are has puzzled selenologists since the discovery last year, and one explanation is that they are the remnants of enormous meteorites. 1969Sci. Jrnl. May 61/1 The so-called mascons extend laterally for 50 to 200 km, are about 5 km thick and lie at a depth of between about 50 and 100 km. 1971Nature 26 Nov. 168/2 The following findings were announced... Gravitational anomalies which may be caused by martian mascons. 1973J. Strong Search the Solar Syst. x. 104 Density anomalies, or ‘mascons’ on the Moon were located by their disturbance of the lunar orbiters. |
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