VOCABULARY
Across
- 3. the object's orbital motion around another object
- 4. a huge collection of dust, gas, and billions of stars and their solar systems, all held together by gravity
- 6. any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all
- 9. time based on the meridian through a particular place as contrasted with that of a time zone
- 12. group of stars that appears to form a pattern or picture
- 14. cosmic snowballs of frozen gases, dust, rock that orbit the sun
- 15. vertical elevation of an object above a surface
- 17. objects in space such as the sun, moon, planets, and stars
- 18. everything that exists, especially all physical matter, including all the stars, planets, galaxies, etc
- 19. very long-period waves that move through the ocean in response to the forces exerted by the moon and sun
- 20. a center of activity, attraction, or attention
Down
- 1. astronomical model in which the Earth and planets revolve around the sun at the center of the universe
- 2. the action of rotating around an axis or center
- 5. absolute measure of radiated electromagnetic power light, the radiant power emitted by a light-emitting object over time
- 7. a closed plane curve generated by a point moving in such a way that the sums of its distances from two fixed points is a constant
- 8. the sun together with the group of celestial bodies that are held by its attraction and revolve around it
- 10. a freely swinging pendulum that consists of a heavy weight hung by a long wire
- 11. small rocky body that orbits the sun
- 13. a small body of matter from outer space that enters the Earth's atmosphere
- 16. a complete or partial hiding of the sun caused by the moon's passing between the sun and the Earth