How do astronomers utilize the IGM to verify models of structure formation?

Answer

By studying the light from distant quasars as it passes through the tenuous gas

Astronomers map the distribution of this tenuous gas by analyzing how light emitted by distant quasars is absorbed as it travels through the IGM, which helps verify models of hierarchical structure formation.

How do astronomers utilize the IGM to verify models of structure formation?

#Videos

Scientists Detect Glow of Hidden Stars Outside of Galaxies ...

Spacegalaxyexistenceuniversecosmology