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