Space Systems Vocab

2. 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.
3. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
4. The scientific study of celestial objects
8. all existing matter and space considered as a whole
9. an imaginary line in which a body rotates
12. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
14. the distance that light travels in a vacuum in one Julian year
15. or a number which scales, or multiplies, some quantity.
16. an object in space that orbits or circles around a bigger object.
17. the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.
18. an astronomical body orbiting Earth as its only natural satellite.

1. a calender used throughout most of the world
3. a superseded description of the Universe with Earth at the center.
5. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
6. a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution.
7. teh sun and all objects that orbit around it the sun is orbited by planets, astroids, comets, etc.
10. a band of small clestial bodies beyond the orbit of Neptune from which many short period comets are belived to origionate
11. a celestial body moving in an elliptical orbit around a star
13. an optical instrument designed to make distant objects appear nearer and this results on the image being magnified.
18. both a property of a physical body and a measure of its resistance to acceleration when a net force is appl