Across
- 2. a graph that shows the relationship between a stars surface and absolute magnitude
- 3. a gigantic explosion which a massive star collapses
- 6. distance a light travels in a year
- 7. the actual brightness of an object
- 8. all the frequencies or wavelengths of electromagnetic radiation
- 9. space and all matter and energy in it
- 11. a collection of stars dust and gas held together by gravity
- 12. small hot dim star
Down
- 1. brightness of a star seen from earth
- 4. a star collapsed under gravity and formed neutrons
- 5. a measure of how bright a star would be
- 10. a large cloud of gas and dust