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