When summed across the immense volume of space, what role does the diffuse IGM play regarding baryonic matter?

Answer

It accounts for a substantial reservoir of the universe's basic building blocks

Although the IGM is spread thinly, when all of this diffuse material across the vast volume of space is accounted for, it represents a significant portion of the total baryonic matter in the universe.

When summed across the immense volume of space, what role does the diffuse IGM play regarding baryonic matter?

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