• The term "telescope" was coined by the Italian scientist and mathematician Galileo Galilei (1564–1642) Galileo built the first telescope in 1608.
  • His telescope used two lenses to make distant objects appear both nearer and larger.
  • Around 1670, Sir Isaac Newton built a different kind of telescope.
  • Newton's telescope used curved mirrors instead of lenses to focus light.
  • This type of telescope is called a reflecting telescope, or reflector.
  • Radio telescopes collect radio waves.
  • These telescopes are even larger telescopes than reflectors.
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