Intergalactic dust

Intergalactic dust is cosmic dust in between galaxies in intergalactic space.^[1] Evidence for intergalactic dust has been suggested as early as 1949, and study of it grew throughout the late 20th century.^[1] There are large variations in the distribution of intergalactic dust.^[1] The dust may affect intergalactic distance measurements, such as to supernova and quasars in other galaxies.^[2]

Intergalactic dust can be a part of intergalactic dust clouds, shown to exist around some other galaxies since the 1960s.^[1] By the 1980s, at least four intergalactic dust clouds were discovered within several megaparsec (Mpc) of the Milky Way galaxy,^[1] and an example of this is the Okroy cloud.^[1]