1989
Cosmic  


The Great Wall of galaxies is found.

The Great Wall of galaxies is found. After surveying 5,000 galaxies, the American astronomers Margaret Geller & John Huchra find that they are arranged in thin sheets wrapped around huge voids nearly empty of galaxies, like a froth of soap bubbles. Among these sheets, the Great Wall stretches millions of light years. It is the largest known structure in the universe.
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