Uranus was the first planet to be discovered by telescope. In 1781, William Hershel was looking through his home made telescope in his garden at Bath, England, when he noticed a green coloured star. He knew green stars don't exist so he knew it was something unusual. After a few days of observing, he realised it was orbiting the sun and was a new planet. It was almost called Planet George, after the King.

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William Hershel House in Bath where the planet was discovered.