Galileo Galilei was the first person to study the sky through a telescope.
This Italian astronomer and physicist was one of the world's greatest scientists.
An astronomer is someone who studies the stars.
The inventor of the telescope was a Dutch optician by the name of Hans Lippershey.
Galileo made his telescope in 1609, a year after Hans around the planet Jupiter.
At that time,people still believed that the moon and the planets revolved around the earth.
Galileo also looked at the moon through his telescope.
People were amazed when he told them that the moon had a rough surface.