Telescopes collect and magnify light from faint and distant objects, allowing us to look further into space than can be seen with the naked eye. The first telescopes were used in the early 17th century and there are three types now used today: Refracting, Newtonian and Schmidt-Cassegrain telescopes. The image they produce can be viewed through an eye-piece or the light collected by a detector for analysis.
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Authors: Carolyn Brinkworth and Claire Thomas
Last updated: July 2001