Across
- 5. The moon orbits earth in the prograde direction and completes one revolution relative to the Vernal Equinox
- 7. A unit of astronomical distance equivalent to the distance that light travels in one year
- 11. Unit of measurement equal to 149.9 million kilometers
- 13. What is used for judging, evaluating, or selecting something
- 15. To make minor changes
- 16. A limit or restriction
- 17. A large spiral system of about several hundred billion stars one of which is the sun
Down
- 1. A celestial body orbiting the earth or another planet
- 2. The force that attracts a body toward the center of the earth
- 3. The collection of eight planets and their moons in orbit around the sun together with smaller bodies in the form of asteroids, meteoroids and comets
- 4. The natural satellite of the earth visible by reflected light from the sun.
- 6. Energy in the form of heat
- 8. The curved path of a celestial object or spacecraft around a star, planet, or moon especially a periodic elliptical revolution
- 9. A small rocky body orbiting the sun
- 10. Celestial object consisting of a nucleus of ice and dust and when near the sun a tail of gas and dust particles
- 12. A system of millions or billions of stars together with gas and dust held together by gravity
- 14. All existing matter and space considered as a whole; the cosmos