Space Systems

6. The curved path of a celestial object
7. A modification of the Julian Calendar
10. The range of wavelengths or frequencies
12. A celestial body that resembles a small planet but lacks certain criteria that are required for it to be classed as such.
14. A large system of dust, gas, stars, and other celestial bodies that have a particular shape.
15. An instrument designed to make distant objects appear nearer
17. A celestial body moving in an elliptical orbit around a star
19. An imaginary line that runs through the middle of an object
20. The collection of 8 planets and their moons in orbit around the sun.

1. Astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System
2. An object that has been intentionally placed into orbit
3. A region of the solar system beyond the orbit of Neptune
4. Visible at night by reflected light from the sun
5. A fixed luminous point in the night sky
8. A celestial object consisting of a nucleus of ice and dust
9. Large body of matter with no definite shape
11. A number which scales or multiplies a quantity
13. A unit of astronomical distance
16. All existing matter and space considered as a whole
18. Branch of science that studies planets, stars, and other objects in space