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The '''telescope''' is an [[optical]] instrument made with lenses and [[mirror]]s which shows magnified views of distant objects. Its [[invention]] is usually credited to [[Hans Lippershey]]. However, [[Galileo|Galileo Galilei]] later made significant improvements to the telescope. He was the first person to use telescope to look at objects in the [[sky]] and to write about what he discovered.

The '''telescope''' is an [[optical]] instrument made with lenses and [[mirror]]s which shows magnified views of distant objects. Its [[invention]] is usually credited to [[Hans Lippershey]]. However, [[Galileo|Galileo Galilei]] later made significant improvements to the telescope. He was the first person to use telescope to look at objects in the [[sky]] and to write about what he discovered.

Galileo discovered the [[moon]]s that revolve around the [[planet]] [[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 even believed that this 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 the [[moon]]s that revolve around the [[planet]] [[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.

The simplest telescopes (and the kind Galileo worked with) are built with two lenses in a tube.

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

During the twentieth century, [[astronomer]]s built huge telescopes. Some of the most famous in the United States are:

During the twentieth century, [[astronomer]]s built huge telescopes. Some of the most famous in the United States are:

*the [[Mount Palomar Observatory]] near San Diego, [[California]];  

*the [[Mount Palomar Observatory]] near San Diego, [[California]];  

*the [[Keck Telescope]] on Mauna Kea in [[Hawaii]].

*the [[Keck Telescope]] on Mauna Kea in [[Hawaii]].

*the [[Hubble Space Telescope]], in Earth orbit.

*the [[Hubble Space Telescope]] in Earth orbit.

[[Category:Astronomy]]

[[Category:Astronomy]]

[[Category:Vision]]

[[Category:Vision]]