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