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The history of astronomy is a history of receding horizons.
– Edwin Powell Hubble
We find them smaller and fainter, in constantly increasing numbers, and we know that we are reaching into space, farther and farther, until, with the faintest nebulae that can be detected with the greatest telescopes, we arrive at the frontier of the known universe.
Equipped with his five senses, man explores the universe around him and calls the adventure Science.
The great spirals… apparently lie outside our stellar system.