Micrometeoroids are tiny particles from space, typically measuring less than a millimeter in size. They originate from comets, asteroids, and other celestial bodies, and they travel through space at high speeds. When they enter the Earth's atmosphere, they can burn up and create bright streaks of light known as meteors. These small space rocks can also impact spacecraft and satellites, posing a risk to their integrity. Scientists study micrometeoroids to understand their composition and behavior, which helps improve the design of protective measures for spacecraft and contributes to our knowledge of the solar system.