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