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