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The '''telescope''' is an [[optical]] instrument made with lenses and [[mirror]]s which shows magnified views of distant objects. The [[invention]] of the refracting telescope (or "spyglass") is usually credited to [[Hans Lippershey]]. When [[Galileo|Galileo Galilei]] encountered the spyglass, he made himself a much more powerful one, and was the first person in history to make detailed recorded observations of the objects in the nighttime sky.

The '''telescope''' is an [[optical]] instrument made with lenses and [[mirror]]s which shows magnified views of distant objects. The [[invention]] of the refracting telescope (or "spyglass") is usually credited to [[Hans Lippershey]]. When [[Galileo|Galileo Galilei]] encountered the spyglass, he made himself a much more powerful one, and was the first person in history to make detailed recorded observations of the objects in the nighttime sky.

Galileo discovered lights that went back and forth around the [[planet]] [[Jupiter]], which we know know as the four largest [[moons of Jupiter]]. These can seen by anyone with a pair of modern [[binocular]]s; they usually look like three or four [[star]]s that are close to Jupiter and all lined up in a straight line. This discovery was important because at the time [[philosopher]]s and [[theologian]]s believed that everything in the [[universe]] revolved around the [[Earth]]. They believed that the geocentric design reflected the will of [[God]]. Galileo's discoveries and his insistence on publishing them put him into conflict with the [[Catholic Church]] and even led to his being put under house arrest.

Galileo discovered lights that went back and forth around the [[planet]] [[Jupiter]], which we know know as the four largest [[moons of Jupiter]]. These can seen by anyone with a pair of modern [[binocular]]s; they usually look like three or four [[star]]s that are close to Jupiter and all lined up in a straight line. This discovery was important because at the time [[philosopher]]s and [[theologian]]s believed that everything in the [[universe]] revolved around the [[Earth]]. They believed that the geocentric design reflected the will of [[God]].  

The simplest telescopes (e.g., the kind Galileo worked with) are built with two lenses in a tube (see [[Refraction]]).

The simplest telescopes (e.g., the kind Galileo worked with) are built with two lenses in a tube (see [[Refraction]]).