Building a better refractor The spyglass-turned-telescope had limitations ... when he succeeded in magnifying the image 20 or 30 times. Galileo's contemporary Johannes Kepler, a German ...
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The Evolution Of The Telescope, From Galileo To Hubble And BeyondAfter building his first telescopes, Galileo demonstrated the new instrument ... the OSIRIS-REx spacecraft (a machine only about 20 feet long) from 7 million miles away. Even larger observatories ...
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