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