Man's best window on the universe is the 200-inch Hale telescope on Palomar Mountain. It is a good window, but not good enough to satisfy the astronomers. It sees only a billion light-years into space, and the universe is a great deal bigger than that. The astronomers would like to see more.
There is not much point in building a big brother for the Hale telescope. Even if its mirror were made twice as wide (a monstrously difficult and costly undertaking), it would see only twice as far into space. It might not see even as far as that;...
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