Across
- 5. Earth's natural satellite
- 7. A huge ball of hot glowing gas, like our Sun
- 9. A place in space where gravity is so strong that not even light can escape
- 11. An instrument used to see distant objects in space
- 13. A giant cloud of gas and dust in space
- 14. When one space object moves into the shadow of another
- 15. The smallest planet and the closest to the Sun
- 17. Light from the Sun takes about _ minutes to reach Earth
- 18. The force that keeps planets in orbit around the Sun
- 19. A bowl-shaped dent made by an impact on the Moon
- 20. The star at the center of our solar system
- 21. A vehicle that launches spacecraft into orbit
- 23. The Moon's gravity is about one _ of Earth's gravity
Down
- 1. The distance light travels in one year
- 2. The number of people who have walked on the Moon is _
- 3. An icy space object with a glowing tail
- 4. A person trained to travel in space
- 6. A giant group of stars, gas and dust, such as the Milky Way
- 8. The largest planet, with a famous Great Red Spot
- 10. The hottest planet in our solar system
- 12. The planet with the most spectacular rings
- 15. The Red Planet
- 16. The time Earth takes to orbit the Sun once
- 17. The third planet from the Sun
- 22. The curved path of a planet around a star