Which ONE of the following statements about galaxies and large - scale structures such as voids, clusters, superclusters, sheets, and filaments is probably NOT true.
(The other statements are true.)
a) Galaxies and clusters and the structures in which they are embedded formed from tiny density enhancements that were present in the early universe.
b) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
c) Many clusters and superclusters are still in the process of formation as their gravity gradually pulls in new members.
d) Voids began their existence as regions in the universe with a slightly lower density than the rest of the universe.
