Across
- 3. This is the first outer planet composed of mostly liquid.
- 5. This celestial body spins on its axis while it revolves around Earth and has no atmosphere.
- 10. A theory that our universe began with an explosion some 13.7 billion years ago
- 12. These happen when the moon's shadow falls on part of Earth.
- 13. This is the closest planet to the sun.
- 15. The nearest star to Earth that's composed of mostly hydrogen in the plasma phase.
- 16. Relatively small pieces of debris chipped off asteroids or comets
Down
- 1. A meteoroid that survives the trip through the atmosphere and reaches the Earth's surface
- 2. Another name for the outer planets.
- 4. This is when the Earth's shadow falls on the moon
- 6. A theory that the planets formed together from a cloud of gas and dust or a nebula. (2 words)
- 7. Small rocky bodies that orbit the sun
- 8. These differ from asteroids in chemical composition and are masses of water, methane, and ice
- 9. Another name for the inner planets.
- 11. This planet is 4th from the sun and a potential away from home habitat.
- 14. This celestial body was classified as a dwarf planet in 2006.