It is formed when a star, such as the Sun, sends out atoms. Some of the atoms become ions by gaining or losing electrons and becoming negatively and positively charged. These oppositely charged ions form an ionic bond, sticking together in tiny crystals, a few thousand nanometres across, to form cosmic dust.
Cosmic dust is split into further types of dust, based on the dust's location. These types include intergalactic dust, which can be found between galaxies, interstellar dust, found between stars, circumplanetary dust, which can be found around planets and in planetary rings and interplanetary dust, which can be found between planets.