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| 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 |
| cosmic dust | |
| —n | |
| See also nebula fine particles of solid matter occurring throughout interstellar space and often collecting into clouds of extremely low density | |