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Sir William Herschel announced its discovery on March 13, 1781, expanding the known boundaries of the Solar System for the first time in history and making Uranus the first planet discovered with a telescope.

In 1781, the first planet to be discovered using the telescope was Uranus.

What are planets?

Planets are the celestial body that orbits around the sun. There are 8 planet in our solar system i.e. Mercury, Venus, earth, mars, Jupiter, Saturn , Neptune and Uranus.

Uranus was the first planet to be discovered by the telescope in 1781 which expanded the limits of the solar system.

Thus the correct option is Uranus.

Learn more about Telescope here:

https://brainly.com/question/556195

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