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Galileo Galilei invented the refractor telescope. There wasn't an exact date but there was a year.
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Johannes Kepler improved the refractor by changing the eye piece to give a clearer and wider view.
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Sir Isaac Newton needed to make a better telescope because the refractors were getting out of hand.
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Lord Rosse and some other men were assembled to make a large reflector telescope to study nebuli.
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Tyson Yerkes funded the new and improved telescope and made it the biggest one in the world.
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George Ellery Hale wanted to study the sun so he made a spectroheliograph which takes pictures of the sun with out you needing to be looking right at the sun.
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George W. Ritchey was making reflector telescopes but then he made one that takes pictures of that he is looking at.
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Karl Jansky discovered radio waves coming from space and made a radio wave telescope. This sends radio waves out and they bounce off the planets and come back.
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It is unclear who invented it but this reflection telescope was invented with 6 small mirrors instead of 1 big one.
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The Hubble telescope is a reflector telescope and it orbits Earth at 375 miles above the surface.
