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Galaxies are seen deep into the universe.

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NASA's Nancy Grace Roman Space Telescope

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will measure the galaxy distribution
in great detail.

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A slice through the distribution

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shows a web-like pattern of galaxies.

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It also reveals regions
with very few galaxies

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that astronomers call voids.

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Roman will be able to measure voids
from the very large

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down to the very small.

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In addition to the galaxy distribution,

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the void distribution will provide

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another powerful test
of cosmological models.