micrometeorite
- n a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere
- A delicate microphone listens for vibrations set up in the satellite's steel skin when it is hit by a micrometeorite.
- They also reloaded their solar-telescope array with fresh film and set up a micrometeorite-measuring experiment.
- From its hull, he detached an instrument that had recorded micrometeorite impacts during Agena's four months in orbit.