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Optical telescopes have come a long way in the past two-and-a-half centuries — from the homemade telescope of William Herschel to the orbiting Hubble Space Telescope.

The United States of America recently turned 250 years old. What a spectacle! The fireworks were amazing, and millions of proud people celebrated across the nation - even around the world. France lit up the Eiffel Tower; Japan had fireworks. French fighter jets flew above New Yor