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