Intergalactic space is filled with a pervasive medium of ionized gas, the Intergalactic Medium (IGM).
The reionization of the IGM is one of the principal unsolved problems of cosmological structure formation.
A Survey of the Sciences and Arts
Intergalactic space is filled with a pervasive medium of ionized gas, the Intergalactic Medium (IGM).
The reionization of the IGM is one of the principal unsolved problems of cosmological structure formation.