Across
- 2. all Jovian planets have them around them
- 4. one of the inactive planets
- 6. orbit the ___: a criterion to be a planet
- 9. ____ isotopes: this is one reason for Earth's hot interior
- 10. a.k.a. Jovian planet
- 12. terrestrial planets have ___ or no moons
- 13. this process makes the inside of Io volcanically active
- 16. main component of Jovian planets (state of matter)
- 17. a comet's tail points __ from the sun
- 18. medium and large moons are shaped like this
- 19. where most asteroids are
Down
- 1. ice, rock, and metal form this small solar-system object
- 2. a.k.a. terrestrial planet
- 3. Jovian planets have ___ orbital periods
- 5. process that stabilizes an atmosphere
- 7. this is where many comets are located
- 8. in order to be a planet, an object must clear its orbit of __
- 11. unable to clear its orbit, e.g. Pluto
- 14. potato-shaped object of rock and metal
- 15. a sphere around the solar system where comets exist