Could it be Cosmic Dust?

Cosmic Dust

One possible explanation might be that cosmic dust, which is scattered throughout the Universe, absorbs and blocks out the light from the more distant stars. However, if dust absorbs energy, it will heat up, and re-radiate the light. The amount of light does not decrease, instead, the dust merely diffuses the starlight, lessening its intensity and spreading it over a larger area. We would continue to see the light emitted from all of the stars, so the presence of cosmic dust cannot account for the darkness of the night sky. Olber's Paradox can, instead, be reconciled through the finite age and expansion of the Universe - both of which are consequences of the Big Bang.