noun
cosmic dust; space dust; interstellar dust
Scientific term for tiny solid particles in outer space, including interplanetary, interstellar, and intergalactic dust.
宇宙塵は星間空間に広く分布している。
Cosmic dust is widely distributed in interstellar space.
探査機が宇宙塵のサンプルを地球
The probe brought back samples of cosmic dust to Earth.