he found that the planets rotate around each other and that space is massive
Galileo Galilei invented a number of things. One of them was a telescope that allowed him to discover Saturn's first four moons. Galileo was an Italian astronomer.
Galileo did invent a toilet but most people think that he didn't.
He didn't invent science.
no
No.
Galileo didn't invent the thermometer Gabriel Fahrenheit did.
In Italy but Galileo did not discover or invent the compass.
Galileo performed experiments to test his ideas.
No, Venus was already known of in Galileo's time.
Galileo did not discover Saturn. It was know of by the ancients. It can be seen at certain time without the aid of instruments.
The popular answer to this question would be Galileo. However, contrary to popular belief Galileo did not invent the telescope. He built his own telescope about a year after their initial creation and later made significant improvements.
he didn't invent it!