Galaxies are seen deep into the universe.
NASA's Nancy Grace Roman Space Telescope
will measure the galaxy distribution in great detail.
A slice through the distribution
shows a web-like pattern of galaxies.
It also reveals regions with very few galaxies
that astronomers call voids.
Roman will be able to measure voids from the very large
down to the very small.
In addition to the galaxy distribution,
the void distribution will provide
another powerful test of cosmological models.