Solar System

4. a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases
5. Planet closest to pluto
7. the planet closest to the sun
8. has magnitude and direction
10. A rotating disk of dust and gas that surrounds the core of a developing solar system.
12. an oval shape defined by points for which the sum of the distances to two fixed points(foci is a constant;
13. an action exerted on a body that tends to change the body's state of rest or motion;
16. a stream of high-speed,
18. The red planet
19. the location within Earth along a fault at which the first motion of an earthquake occurs; one of the two central defining points of an ellipse

1. the path of a body as it moves around another body due to their mutual gravitational attraction
2. the degree of elongation of an elliptical orbit
3. a dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field
4. a gas composed of molecules that absorb and radiate infrared radiation
6. The big blue planet
9. evaporating readily at normal temperatures and pressures;
11. a center line to which parts of a structure or body may be referred
14. the dwarf planet
15. the motion of the axis of a spinning body, such as the wobble of a spinning top,
17. a large cloud of gas and dust in interstellar space; a region in space where stars form