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