Across
- 5. A person who is trained to travel in a spacecraft
- 8. a small body of matter from outer space that enters the Earth's atmosphere
- 9. The closest galaxy to the Milky Way
- 10. the force that attracts a body toward the center of the earth, or toward any other physical body having mass
- 11. The star at the center of Earth's solar system
- 13. A person who studies outer space
Down
- 1. The physical universe beyond the earth's atmosphere
- 2. A massive ball of burning gas in space
- 3. A system of millions or billions of stars
- 4. A small rocky body orbiting the sun
- 6. A large body orbiting a star
- 7. The curved path of a celestial object or spacecraft around a star, planet, or moon
- 8. A natural satellite orbiting a planet
- 11. A celestial body orbiting the earth or another planet
- 12. Space entirely devoid of matter