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