1. Which planet has the most moons?

2. What force keeps planets in orbit around the Sun?

3. Who developed the theory of relativity?

4. What natural phenomenon is measured by the Richter scale?

5. What is the freezing point of water in Fahrenheit?

6. What nickname did Albert Einstein give to quantum entanglement?

7. Which famous experiment demonstrated that electrons behave as both waves and particles?

8. What is the name of the observatory that first directly detected gravitational waves in 2015?

9. What concept describes the total amount of disorder in a system?

10. For which discovery did Albert Einstein win his Nobel Prize in Physics?

11. What is the name of the paradox regarding the lack of evidence for extraterrestrial life despite high probability?

12. Which type of organism was responsible for the Great Oxidation Event?

13. What three phases of matter coexist at the triple point?

14. How many phases of a substance are in equilibrium at the 'triple point'?

15. Why are neutrinos often referred to as 'ghost particles'?

16. What is the boundary called where the solar wind meets the interstellar medium?

17. What is it called when a galaxy's light shifts toward longer wavelengths as it moves away from us?

18. Roughly how large is a typical neutron star in diameter?

19. What is the name of the galactic supercluster that contains the Milky Way?

20. What happens to magnetic fields within a superconductor due to the Meissner Effect?