"The structures and star populations of massive galaxies appear to change
as they age, but much about how these galaxies formed and evolved
remains mysterious. Many of the oldest and most massive galaxies reside
in clusters, enormous structures where numerous galaxies are found
concentrated together. Galaxy clusters in the early universe are thought
to be key to understanding the lifecycles of old galaxies, but to date
astronomers have located only a handful of these rare, distant
structures..."
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