telescope s
He constructed galileo's telescope, it magnified ten times than a regular telescope.
Galileo I am not so sure he was the first, but he is the most famous.
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Hissele
No. The magnetic compass was in use centuries before Galileo's time.
Galileo first used a telescope to observe the sky.
A telescope.
after he made it
Galileo Galilei.
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Galileo