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