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A vast mass of gas from which a galaxy is thought to develop.
- ‘According to current models, that's not enough time to allow for the formation of either the quasars that illuminate the atomic gas or the protogalaxies that harbor the first stars.’
- ‘The protogalaxy probably has since coalesced into a giant elliptical galaxy, he says.’
- ‘Those that are still around us bear the imprint of the chemical composition of the protogalaxy in their atmospheres, like living fossils of a bygone era in the history of the Earth.’