Across
- 3. The natural satellite of Earth.
- 4. A collection of billions of stars and planets.
- 6. The scientific word for everything that exists.
- 8. Giant balls of gas that shine in the night sky.
- 10. An object made of ice and dust that has a bright tail when near the sun.
- 12. A path an object takes as it moves around another object in space.
- 13. The largest planet in our solar system.
- 15. The force that pulls objects toward each other.
- 17. The energy that makes things visible.
- 18. The type of energy that we feel as warmth from the sun.
Down
- 1. The space above the Earth where clouds and airplanes are.
- 2. A large object that orbits Earth and lights up the night.
- 4. A mix of elements that can fill space, like air.
- 5. The smallest part of an element, making up everything.
- 7. What the universe is doing after the Big Bang.
- 8. A hot, glowing ball of gas in space, like the Sun.
- 9. The closest star to Earth.
- 11. Tiny pieces of matter floating in space or on the ground.
- 14. The planet we live on.
- 16. Bang A huge explosion that started the universe.