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The '''telescope''' is an optical instrument made with lenses and mirrors and shows magnified views of distant objects. Its invention is usually credited to Hans Lippershey. However, [[Galileo|Galileo Galilei]] made improvements and first used the telescope to look at objects in the sky.

The '''telescope''' is an optical instrument made with lenses and mirrors and shows magnified views of distant objects. Its invention is usually credited to Hans Lippershey. However, [[Galileo|Galileo Galilei]] made improvements. 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 moons that revolve around the planet Jupiter. These can seen by anyone with a pair of modern binoculars; they usually look like three or four stars that are close to Jupiter and all lined up in a straight line. This discovery was important, because most philosophers and theologians believed that everything in the universe revolved around the Earth, and believed that this design reflected the will of God. Galileo's discoveries, and his insistence on publishing them, put him into conflict with the Church and even led to his being put under house arrest.  

Galileo discovered the moons that revolve around the planet Jupiter. These can seen by anyone with a pair of modern binoculars; they usually look like three or four stars that are close to Jupiter and all lined up in a straight line. This discovery was important, because at the time philosophers and theologians 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.

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

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