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