Astronomy terms

3. is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity
5. typically large body of matter with no definite shape
7. a celestial body moving in an elliptical orbit around a star
9. the fifth planet from the Sun and the largest in the solar system
12. The fourth planet from the Sun and the second smallest in the solar system
13. a faint, milky-looking band of light visible in the night sky and the spiral galaxy that contains our solar system
14. the sun in which the moon does not cover the entire disc of the sun, so that a ring of sunlight surrounds the shadow of the moon
15. an artificial body placed in orbit around the earth or moon
16. This is an interstellar cloud of gas and dust
18. an invisible and hypothetical form of matter that does not interact with light
19. the planet on which we live

1. A place in space where matter and light cannot escape if they fall in
2. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
4. a person that is trained to be in space
6. three theorems describing orbital motion
8. the branch of science that deals with celestial objects, space, and the physical universe as a whole
10. a force that attracts a body toward the center of earth
11. The layer of gases surrounding the surface of a planet
15. a large, luminous sphere of hot gas
17. substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars