cosmic dust

cosmic dust

noun Astronomy.
fine particles of matter in space.

Origin:
1880–85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cosmic dust is always a great word to know.
So is satellite. Does it mean:
the brightness of a star in comparison with that of the sun: the luminosity of Sirius is expressed as 23 and indicates intrinsic brightness 23 times greater than the sun
a natural body that revolves around a planet such as a moon
Collins
World English Dictionary
cosmic dust
 
n
See also nebula fine particles of solid matter occurring throughout interstellar space and often collecting into clouds of extremely low density

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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