1989: Margaret Geller and John Huchra Map the Universe
|Image of Margaret Geller courtesy of Massimo Ramella.|
Once Edwin Hubble showed that the Milky Way was not the only galaxy, astronomers began to take finer and finer images of distant galaxies, and it soon became evident that galaxies came in clusters. Our own cluster, called the “Local Group” has about 20 galaxies. Some clusters have more than 1,000 galaxies. But are there clusters of clusters of galaxies?