Related Clues:
- Unit of force
- Early sunspot studier
- Classic Italian astronomer
- Law of gravity formulator
- Telescope pioneer
- Gravity beholder
- Force unit
- 1600's stargazer
- Noted mathematician
- See 12-Across
- Advocate of Copernicus
- Sir Isaac of science
- Formulator of the law of universal gravitation
- 'Opticks' writer
- Spacecraft to Jupiter