Science

2. a cloud of gas and dust.
6. opposite charges attract while same charges repel.
9. the explosion of a massive star caused by gravitational collapse with the emission of enormous quantities of matter.
10. a cool giant star.
11. cloud of gas and dust that gives rise to planets.
13. a body of gas on its way to becoming a star before thermonuclear fusion begins.
14. the degree of compactness of a substance.
17. the idea that the sun and planets formed together from a cloud of gas and dust.

1. super dense central remnant of a supernova that spin at fantastic speeds.
3. a mass of gas and plasma held together by its own gravity that produces its own light through thermonuclear reactions.
4. a cold black lump of matter that forms from a dying star.
5. small bodies eventually growing into planets.
7. to decrease in size.
8. process which hydrogen is converted to helium and enormous amounts of thermal and radiant energy are released.
12. an event within a white dwarf suddenly brightens and appears as a new star.
15. a dying star that has collapsed to an Earth-like size and is slowly cooling off.
16. growth due to the gradual accumulation of matter.