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Cosmic fog and smog

It emerges that most of the elements heavier than helium are not found in galaxies, where they can be mixed into future stars and planets. Instead, these elements largely reside far from galaxies in ionized gas and dust particles.

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Figure 1: Observing the diffuse gas outside galaxies.


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Correspondence to Molly S. Peeples.

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Peeples, M. Cosmic fog and smog. Nature 517, 444–445 (2015).

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