Space Systems Vocab

2. a celestial body resembling a small planet but lacking certain technical criteria required for it to be classified as such
4. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
7. a sun an all objects that orbit around it the sun is orbited by planets, asteroids, comets, and etc.
9. a celestial body moving in elliptical orbit around a star
11. an optical instrument designed to make distant objects appear nearer and this results from the image being magnified
13. both a property of a physical body and a measure of its resistance
14. an imaginary line in which a body rotates
16. a superseded description of the universe with earth at the center
17. luminous point in the night sky which is a large, remote incandescent body like the sun
19. the astronomical model in which the earth and planets revolve around a sun at the center of the solar system

1. a calendar used mostly around the world
3. the cosmological model of the observable universe from the earliest known periods through its subsequent large scale evolution
5. the scientific study of celestial objects
6. a celestial object consisting of a nucleus of ice and dust and when near the sun," a tail" of gas and dust particles pointing away from the sun
8. a number in which scales, multiples, some quantity
10. a band of celestial bodies beyond the orbit of Neptune from which many short-period comets are believed to originate
12. all existing matter and space considered as a whole
15. an object in space that circles or orbits around a bigger object in space
18. an astronomical body orbiting the earth as its only natural satellite
20. the distance that light travels in a vacuum Julian year