Clusters of galaxies do not appear in an instant. Instead they gradually form through the accumulation of many galaxies. But when galaxies fall in they don't just stop moving. Instead, they keep moving around. These are called backsplash galaxies, and astronomers are using them to help understand the formation history of their home clusters.
Clusters of galaxies do not appear in an instant. Instead they gradually form through the accumulation of many galaxies. But when galaxies fall in they don't just stop moving. Instead, they keep moving around. These are called backsplash galaxies, and astronomers are using them to help understand the formation history of their home clusters.
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