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Answer for the clue "Particles from outer space ", 15 letters:
micrometeorites

Word definitions for micrometeorites in dictionaries

Wiktionary Word definitions in Wiktionary
n. (plural of micrometeorite English)

Usage examples of micrometeorites.

If an alien probe is there, could we spot it among the countless dots and specks that will represent stars, micrometeorites, planetoids, photographic plate flaws, and dust?