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The telescope of Galilei was invented in 1609.
Telescope (from tele... and scope) is an astronomic instrument for the celestial luminaries study on their electromagnetic radiation. The telescopes are divided into gamma-telescopes, X-rays and ultraviolet, optical, infrared and radiotelescopes. There are 3 types of optical telescopes: refractors (lens), reflectors (mirror), and combined (mirror-lens) telescopes. The first astronomic observations with telescopes (optical refractor) were carried by Galilei in 1609.
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