Galileo, news of this invention, decided design and build one. In 1609 showed the first recorded astronomical telescope. Thanks to the telescope, made major discoveries in astronomy, notably the observation on January 7, 1610, four moons of Jupiter by turning on this planet.
Known until then as the lens spyware, the name "telescope" was first proposed by the Greek mathematician Giovanni Demisiani 14 April 1611 during a dinner in Rome in honor of Galileo, dinner in which attendees were able to observe the moons of Jupiter from the telescope that Galileo had brought.
There are several types of telescope: refractors, using lenses; reflectors, they have a concave mirror instead of the objective lens and reflectors, they have a concave mirror and a corrective lens.
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