While space is often thought of as a vacuum and free of particles due to the extremely low densities of interstellar matter, it does contain a small amount of dust and dirt, primarily in the form of cosmic dust and micrometeoroids.

* Cosmic dust: These are tiny particles of solid matter found throughout the universe. They can range in size from a few nanometers to several millimeters, and are composed of various elements, minerals, and organic molecules. Cosmic dust is mainly produced through stellar explosions such as supernovae or through collisions between asteroids and comets. It can be found in interstellar space, within galaxies, and even in our own solar system.

* Micrometeoroids: These are small rocky and metallic particles that range in size from 100 micrometers to a few millimeters. Micrometeoroids are fragments of comets, asteroids, and other celestial objects that have broken apart or collided with each other. They are abundant in interplanetary space and can impact spacecraft and satellites, potentially causing damage.

Both cosmic dust and micrometeoroids can be found in the Earth's atmosphere, as they enter our planet's gravitational pull and are slowed down by the resistance of the atmosphere.

While the amount of dirt and dust in space is significantly lower compared to the Earth's environment, it is not entirely absent, and these particles can have impacts on astronomical observations, spacecraft operations, and the study of planetary systems.