Space

2. An enormous system of stars, dust, and gas.
3. The fourth planet from the sun, known as the Red Planet.
7. Relating to the moon.
9. The path one celestial body takes around another.
10. Pertaining to the sun.
14. A person trained to travel in a spacecraft.
15. A region of space having a gravitational field so intense that no matter or radiation can escape.
16. An instrument for observing distant objects.
18. A small rocky body orbiting the sun.

1. A space probe launched by NASA to study the outer planets.
3. A small body of matter from outer space that enters the earth's atmosphere.
4. A stellar explosion that briefly outshines an entire galaxy.
5. A celestial body moving in an elliptical orbit around a star.
6. The theoretical explosion that started the universe.
8. NASA's program that landed humans on the moon.
11. A celestial object consisting of a nucleus of ice and dust.
12. A cloud of gas and dust in space.
13. A private American aerospace manufacturer and space transport services company.
17. The universe seen as a well-ordered whole.
19. A robotic vehicle designed to explore the surface of a planet.