Democritus Isaac Newton Galileo Galilei Anton Van Leeuwenhoek
I gave my students this multiple choice question: In the 20th century, Edwin Hubble deduced from observations that there are galaxies other than the Milky Way. Hubble's observations depended on improvements in a technology first developed by which scientist?

Only one answer is correct among these 4 choices:
- Democritus
- Isaac Newton
- Galileo Galilei
- Anton Van Leeuwenhoek

Could you tell me which one is correct?

Galileo Galilei