Astronomy Terms Part 1

1. the resistance that one surface or object encounters when moving over another.
4. A small rocky body orbiting the sun in a circular path
8. How scientists represent through diagrams or other objects a complex system or a concept to test ideas
11. When the net force on an object is not equal to zero.
12. Bright celestial objects of great size that burn with nuclear fusion and may be the center of a solar system.
13. When the net force on an object is equal to zero.
15. The curved path of a celestial object or spacecraft around a star, planet, or moon.
17. The act or process of changing position.
20. A force that a surface exerts to prevent solid objects from passing through each other.
21. Void of any molecules

2. A small rocky body orbiting the sun in an elliptical path
3. A gas that can cause resistance on falling objects or in opposite directions of the motion of an object.
5. The rate at which something moves, the distance traveled over time.
6. The symbol for diagraming a force in free body diagrams.
7. strength or power used on an object
9. Not a force but a characteristic of matter
10. The amount of matter in an object.
14. The scientist responsible for describing gravity.
16. A scale to measure stars and other space objects
17. Another name for the strength of a force.
18. a force that pulls and draws objects toward each other
19. a proportion between two sets of dimensions (ex. solar system and a drawing)