noun
micrometeorite
Scientific term for tiny extraterrestrial particles that enter Earth's atmosphere; often discussed in astronomy and planetary science.
流星塵は大気圏に突入しても燃え尽きずに地表に到達することがある。
Micrometeorites can reach the Earth's surface without burning up upon entering the atmosphere.
Compound of 流星 (meteor) and 塵 (dust, tiny particle). The term directly describes the concept of meteoritic dust.