Astronomers have long known that the space between the stars contains a good bit of gas, dust, and probably larger chunks of unattached matter. The space between galaxies, however, they believed to be virtually empty. The only exceptions they knew about were faintly luminous filaments that seemed to connect a few galaxies.
This week Astrophysicist Fritz Zwicky of CalTech announced his conclusion that these filaments are probably the rule in space, rather than the exception. With the 48-inch Schmidt telescope on Palomar Mountain he found hundreds of luminous "bridges" connecting widely separated galaxies....
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