Across
- 6. - A luminous sphere of plasma in space.
- 7. System - The Sun and its orbiting celestial bodies.
- 9. - Protective gear for astronauts in space.
- 10. - A massive system of stars, gas, and dust.
- 11. - A celestial object with a tail of gas and dust.
- 12. - A small rock or particle in space.
- 15. - A cloud of gas and dust in space.
- 16. - An object in orbit around a celestial body.
- 17. Hole - A region of space with strong gravitational forces.
- 18. - Natural light displays in the Earth's sky.
- 19. - A planet outside our solar system.
Down
- 1. - A celestial body that orbits a star.
- 2. - The fourth planet from the Sun.
- 3. - Relating to the Moon.
- 4. - A person who travels in space.
- 5. - The force that attracts objects toward each other.
- 6. - An activity conducted by astronauts outside a spacecraft.
- 8. - A small rocky object in space.
- 13. - A vehicle designed for space travel.
- 14. - An optical instrument for observing distant objects.