A Brief History of the Discovery of Cosmic Voids - by PaulMattSutter
At first the sum total of large, orderly structure in the Universe appeared to arrive in two categories. There were the clusters of galaxies – an unoriginal but descriptive name – each a dense ball with anywhere from a few dozen to a few hundred galaxies, all bound together by their mutual gravitational embrace. And then there were the field galaxies, lonely wanderers set apart and adrift from the clusters, not bound to anyone but themselves.
But technology is technology and advancement is advancement. The telescopes grew more powerful. The field of cosmology involved more people. The techniques improved. The development of image amplification systems – the distant forerunners of your smartphone camera – allowed astronomers to peer. With every new survey taken, the number of galaxies in our Universe increased. With every night of observation, our window into the cosmos widened.
By the early 1960’s, astronomers began to realize that there was more in the Universe than mere galaxies and clusters. There was something larger –. It only took a small sample of galaxies to reveal the shape of the first known supercluster, the Local Supercluster, with the galaxies themselves – each one the mass of a trillion suns – reduced to a tiny dot of light, acting as mere tracers of the vast structure that stretched for a million parsec on a side.
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