Astronomy › Section U · Evolution and distribution of galaxies › Topic U.3

Groups, clusters, and the cosmic web

Galaxies are not sprinkled evenly through space. They gather into groups and clusters, which line up along vast filaments and sheets around nearly empty voids, a pattern called the cosmic web.

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In this topic

The same in every direction
The Local Group
Galaxy clusters
Worked example: crossing a cluster
Gravitational lensing
Superclusters and Laniakea
The cosmic web and voids
Worked example: the cost of mapping deeper
What is expanding?
Common mistakes to avoid
Key takeaways

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