Across
- 2. A gigantic explosion in which a massive star collapses and throws it's layers into space.
- 4. A collection of stars, dust, and gas bound together by gravity.
- 7. Space and all the matter and energy in it.
- 8. The actual brightness of an object such as a star.
- 9. All of the frequencies or wavelengths of electromagnetic radiation.
- 10. Hertzsprung-Russell diagram a graph that shows the star's surface temperature and absolute magnitude.
- 11. A large cloud of dust in interstellar space.
- 12. A small hot dim star that it the left over center of an old sun like star.
Down
- 1. 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.
- 5. The distance that light travels in a year.
- 6. A measure of how bright a star would be if it were seen from a standard distance.