1.  Galileo was an Italian astronomer who
A. developed the telescope
B. discovered four satellites of Jupiter
C. discovered that the movement of pendulum produces a regular time measurement
D. All of the above

Answer: Option D

Explanation:

Galileo, was an Italian physicist, mathematician, astronomer and philosopher who played a major role in the Scientific Revolution. His achievements include improvements to the telescope and consequent astronomical observations, and support for Copernicanism. Galileo has been called the "father of modern observational astronomy",the "father of modern physics",the "father of science" and "the Father of Modern Science". Stephen Hawking says, "Galileo, perhaps more than any other single person, was responsible for the birth of modern science."