ORIGINS 2B03 Lecture : Lecture 29
9 Feb 2012
School
Department
Course
Professor
Document Summary
Galaxies and clusters appear to be clustered into huge walls with voids between them. Fluctuations in the cbr represent density fluctuations in the early universe. Higher density regions attract matter (especially dark matter), which makes the density higher, which attracts more matter. Clumps of dark matter grew to form the structures we see. On scales of 108 light years, galaxies are distributed in gigantic chains and sheets surrounding great voids. The chains come from the initial regions of density enhancement. The voids come from initial regions of density depletion. On scales of several x109 light years, galaxies appear evenly distributed.
