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单词 light bucket
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light bucket
light bucket n. Astronomy (colloquial) a reflecting telescope with a relatively large aperture, regarded as a device for collecting and focusing low-intensity radiation.
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1952 Science 29 Feb. 225/2 The telescopes should be reflectors (because of their perfect achromatism) and should be of the ‘light-bucket’ type.
1970 Nature 7 Feb. 492/2 Infrared telescopes, more properly called flux collectors—light buckets in the language of astronomy—are cheap compared with similar equipment for the visible spectrum.
2016 Altoona (Pa.) Mirror 27 Nov. d6/3 You'll need a larger light bucket—4 inches or more in diameter—to see fainter star clusters, nebulae and galaxies.
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