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telescope
The Galileo telescope was not "discovered" but rather invented by Galileo Galilei in 1609. He was the first to use a refracting telescope for astronomical purposes, which revolutionized our understanding of the cosmos.
after he made it
A telescope.
Galileo
Galileo
Galileo !
Galileo
Galileo was the first person to use a telescope for astronomical research.
Galileo Galilei.
He invented the reflecting telescope. Galileo was the first to use the telescope for studies of the heavens.
Galileo I am not so sure he was the first, but he is the most famous.