6. What are comets?
- Small objects made of rock and ice that have regimental orbits
- Small objects made of rock and ice that have eccentric orbits
- Large objects made of rock and ice that have regimental orbits
7. What's the equation for orbital speed?
- 2 π r
- 2 π r ÷ t
- 2 r ÷ t
8. Do stars and planets have larger gravitational forces than the moon?
- No, due to their smaller mass
- Yes, due to their larger mass
- No, due to their larger mass
9. What do comets orbit?
- The Sun
- Earth
- Jupiter
