When was the telescope invented?

Galileo is credited with having developed telescopes for astronomical observation in 1609. While the largest of his telescopes was only about 120 cm long and had an objective diameter of 5 cm, it was equipped with an eyepiece that provided an upright image. Galileo used his modest apparatus to explore the valleys and mountains of the Moon, the phases of Venus, and the four largest satellites, which had never been systematically observed before.

The reflecting telescope was developed in 1668 by Newton. He became the first person to use a telescope to see the moons orbiting the planet Jupiter. He also used his theories about gravity to show why the planets orbit the Sun.

Fact File

Special solar telescopes have been constructed so that the intensity of the image of the Sun or other planets, will not damage the observer’s eye.


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