The first telescope were made in 1608 by Dutchman Hans Lippershey. Galileo built his own soon after and used it to Jupiter's moons. The earliest type of telescope, known as a refracting telescope, produced a slight distortion of images (called aberration). Since about 1670, astronomers have used reflecting telescopes, which use mirrors that compensate for the distortion.
The first telescope were made in 1608 by Dutchman Hans Lippershey. Galileo built his own soon after and used it to Jupiter's moons. The earliest type of telescope, known as a refracting telescope, produced a slight distortion of images (called aberration). Since about 1670, astronomers have used reflecting telescopes, which use mirrors that compensate for the distortion.
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