Example Sentences

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Future proposals might look for evidence of those first protogalaxies, perhaps using the explosive deaths of supersized first stars in especially luminous and energetic supernovae as markers for their existence.

From Scientific American • Sep. 14, 2022

Gravity guided the subsequent interactions between these protogalaxies, which eventually merged to form larger galaxies.

From Scientific American • Sep. 14, 2022

But, he added, “they come in herds,” clumps that might be the seeds for the earliest protogalaxies, and they explode: “We can see them when they explode.”

From New York Times • Dec. 20, 2021

Mapping out how protogalaxies formed might also reveal something about the nature of dark matter, Rieke says.

From Science Magazine • Nov. 11, 2021

Other protogalaxies with weaker gravity or less initial rotation flattened very little and became the first elliptical galaxies.

From "Cosmos" by Carl Sagan