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