Across
- 6. all of the frequencies or wavelengths of electromagnetic radiation
- 8. a large cloud of gas and dust in interstellar space;a region where stars are born
- 9. the brightness of a star as seem from earth
- 10. a collection of stars,dust, and gas bound together by gravity
- 11. a small hot dim star that is the left over center of an old sun like star
- 12. a star that collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
Down
- 1. Hertzsprung-Russell diagram a graph that shows the relationship between a stars surface temperature and absolute magnitude
- 2. a gigantic explosion in which a massive star collapses and throws its outer layers into space
- 3. space and all the matter and energy in it
- 4. the distance that light travels in a year; about 9.46 trillion kilometers
- 5. a measure of how bright a star would be if it were seen from a standard distance
- 7. the actual brightness of an object such as a star