Planets/Small Bodies Characteristics

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