cosmic dust

noun Astronomy.
fine particles of matter in space.

Origin:
1880–85

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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
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Example sentences
The gas circles through space in cosmic dust clouds called nebulae.
Also called cosmic dust or space dust gas: noun: state of matter with no fixed shape that will fill any container uniformly.
They still have a lot of their original components-fine grains, specs of cosmic dust, and little molten droplets.
Start worrying in a few million years about a cosmic dust collision, when the sun hits the closest spiral arm of our galaxy.
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