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What is a protogalaxy?

What is a protogalaxy? Here are some definitions.

Noun
  1. A cloud of gas which is starting to form a galaxy.
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The so-called protogalaxy resides about 11 billion light-years from Earth.
Quasar light absorbed by gas in the protogalaxy has revealed the fingerprints of 25 star-forged elements.
They pointed out that cold gas streaming into a massive protogalaxy would heat up from the gravitational energy gained by falling in and would glow of its own accord as a way of cooling off.
The protogalaxy probably has since coalesced into a giant elliptical galaxy, he says.
Rather, Shen's team suggests that the spinning disk of the protogalaxy could have naturally generated a handlelike bar that then thickened on its own.

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