Final

5. — A streak of light caused by a space rock burning up in Earth's atmosphere.
8. — A moon, planet, or machine that orbits a planet or star.
9. — A "dirty snowball" of ice and dust that develops a tail when near the sun.
10. — A huge system of billions of stars, gas, and dust held together by gravity.
12. — Known as the "Red Planet" due to iron oxide on its surface.
13. — The point in the sky directly above an observer.
14. — A small rocky body orbiting the sun, mostly found between Mars and Jupiter.
15. — An instrument used to see distant objects in space.
17. — The season experienced by the hemisphere tilted away from the sun.
19. — The powerful and luminous explosion of a dying star.

1. — The curved path of a celestial object around a star or planet.
2. — Either of the two times in the year when the sun reaches its highest or lowest point in the sky at noon.
3. — The visible surface of the sun.
4. — Einstein’s theory describing the relationship between space, time, and gravity.
6. — A person trained to travel in a spacecraft.
7. — A giant cloud of dust and gas in space, often where stars are born.
11. — The rate at which an object's velocity changes over time.
16. — When one celestial body moves into the shadow of another.
18. — The force that pulls objects toward each other.
20. — A large body that orbits a star and has cleared its neighborhood of debris.