Across
- 4. The four largest of Jupiter- Io, Europa, Ganymede, and callisto
- 5. The time it takes an object to to complete one rotation
- 6. A small, rocky particle that moves through space
- 8. Made out of gas, dust, and ice, and moves in an oval-shaped orbit around the Sun
- 9. The time it takes an object to travel once around the Sun
- 10. Millions of small, rocky objects that orbit the Sun in the Asteroid Belt between he orbits of Mars and Jupiter
Down
- 1. The average distance Earth to Sun-about 150 million km
- 2. Planets closest to the Sun, are made out of rock and metal, have solid outer layers
- 3. Occurs when a planet's atmosphere traps solar energy and causes the surface temperature to increase
- 7. A meteoroid that strikes a planet or moon