| 单词 | great white spot |
| 释义 | > as lemmasgreat white spot great white spot n. (also with capital initials) Astronomy a distinctive white area that is periodically visible through a telescope on the surface of Saturn but is relatively short-lived.Such spots are attributed to violent atmospheric disturbances, and occur approximately every 28–29 years.Before 1933 referred to simply as a white spot: cf. white spot n. 2. ΚΠ 1877 Analyst 4 41 On the Rotation of Saturn... At the time of the discovery of the white spot this determination of Herschel was not known to me.] 1933 Sci. News. Let. 19 Aug. 115/2 (caption) In contrast is the left view [of Saturn] showing the great white spot, taken by Dr. E. C. Slipher. 1992 Sci. Amer. (U.K. ed.) June 21/1 In the fall of 1990 Hubble took..images of Saturn in order to track a 50,000-kilometer-wide storm of ammonia ice crystals, termed the Great White Spot. 2012 P. Ulivi & D. M. Harland Robotic Explor. Solar Syst.: Pt. 3 vii. 184 This was only the sixth such ‘great white spot’ to have been observed during the last 135 years. < as lemmas |
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