Across
- 1. This type of galaxy has a central bulge and spiral arms.
- 3. The most massive object in our solar system.
- 4. A celestial body that orbits a planet.
- 8. A celestial object so dense that not even light can escape it's gravity.
- 10. The point in an orbit closest to the Sun.
- 11. The force that governs the motion of celestial objects.
- 12. The name of the first human to travel to space.
Down
- 2. The mission landed the first humans on the moon.
- 3. The second largest planet in our solar system.
- 5. The smallest planet in out solar system.
- 6. The unit of distance light travels in a year.
- 7. A cloud of gas and dust in outer space.
- 9. The study of universe and it's contents.