What is "microrobots"

Usage examples of "microrobots".

Up came an image of the asteroid's surface—gritty and crumpled, Emma thought, like roadside slush—and there was one of the microrobots they were calling "fireflies.

Up came an image of the asteroid's surface -- gritty and crumpled, Emma thought, like roadside slush -- and there was one of the microrobots they were calling "fireflies.

It seemed as though the cellular microrobots were smart enough to accept the command input from any location and channel it to the appropriate sites.