What are the top 10 discoveries in astronomy and space science?

1. Heliocentric model of the solar system – Nicolaus Copernicus
2. Laws of planetary motion – Johannes Kepler
3. Theory of gravity – Isaac Newton
4. Discovery of Uranus – William Herschel
5. Confirmation of the existence of Neptune – John Couch Adams and Urbain Le Verrier
6. Discovery of pulsars – Jocelyn Bell Burnell
7. Cosmic microwave background radiation – Robert Wilson and Arno Penzias
8. Discovery of exoplanets – Michel Mayor and Didier Queloz
9. Confirmation of the existence of dark matter – Vera Rubin
10. Detection of gravitational waves – LIGO/VIRGO collaboration