Across
- 5. a measure of how bright a star would be if it were seen from a standard distance
- 8. a big explosion in which a massive star collapses and throw out its layers into space
- 10. space and all the matter and energy in it
Down
- 1. the distance that light travels in a year
- 2. Russel diagram that shows the relationship between a star's surface temperature and absolute magnitude
- 3. all of the frequencies of wavelengths of electromagnetic radaition
- 4. a small hot dim star that is the left over center of an old star
- 6. a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
- 7. a collection of stars, dust, and gas bound together by gravity
- 9. a large cloud of gas and dust in interstellar space; a region where stars are born