Across
- 3. a rotating cloud of gas and dust from which the sun and planets are formed.
- 5. a small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and gives off gas and dust in the form of a tail as it passes close to the sun.
- 9. the change in the sunlit area of one celestial body as seen from another celestial body.
- 11. the average distance between Earth and the sun.
- 12. space and all the matter and energy in it.
- 13. a collection of stars, dust, and gas bound together by gravity.
- 15. a disk of gas and dust orbiting a newly formed star, from which planets may eventually form.
Down
- 1. an apparent shift in the position of an object when viewed from different locations.
- 2. an instrument that collects light or other electromagnetic radiation from distant objects.
- 4. a small rocky object that orbits the sun.
- 6. an event in which the shadow of one celestial body falls on another.
- 7. the force of attraction between objects that is due to their masses.
- 8. a division of the year that is characterized by recurring weather conditions and determined by both Earth's tilt relative to the sun and Earth's position in its orbit around the sun.
- 10. the path that a body follows as it travels around another body in space.
- 14. the distance that light travels in one year; about 9.46 trillion kilometers.