astronamy

2. the force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
6. a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid.
7. year a year containing an extra day or extra month in any calendar.
9. the movement or path of the earth or a heavenly body turning on its axis
13. the outer boundary, especially of a circular area; perimeter
15. Also called minor planet.

1. the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.
3. a person or thing that reflects.
4. notation a math for the power of ten
5. a person or thing that refracts.
8. A closed, symmetric curve shaped like an oval
10. a celestial body moving about the sun
11. a half of a sphere.
12. the orbiting of one heavenly body around another.
14. model a representation of the solar system.