Astronomy

1. Space an all the matter and energy in it.
3. A collection of stars, dust, and gas bound together by gravity.
5. The Sun and all of the planets and other bodies that travel around it.
6. A force of attraction between objects that is due to their masses.
8. A region of the solar system that starts just beyond the orbit of Neptune and that contains dwarf planets and other small bodies made mostly of ice.
9. The spin of a body on its axis.
11. The time required for Earth to rotate once on its axis.
13. One of the four planets in our solar system that are small, rocky, and close to the Sun.
16. A small body that gives off gas and dust as it passes close to the Sun; a typical one of these moves in an elliptical orbit around the Sun and it made of dust and frozen gases.
17. The average distance between Earth and the Sun; approximately 150 million kilometers.

2. The motion of a body that travels around another body in space.
3. One of the four planets in our solar system that are large, gaseous, and farther from the Sun.
4. A small, rocky object that orbits the Sun; most of these are located in a band between Mars and Jupiter.
7. The time required for Earth to make one complete revolution around the Sun.
10. The path that a body follows as it travels around another body in space.
12. A division of the year that is characterized by recurring weather conditions and determined by recurring weather conditions and Earth's position in its orbit around the Sun.
14. An event in which the shadow of one celestial body falls on another.
15. A relatively large spherical body that orbits a star.