Across
- 3. a large cloud of gas and dust in interstellar space; a region where stars are born
- 4. a star that has collapsed under gravity to the electrons and protons have smashed together to form neutrons
- 6. spectrum all of the frequencies or wavelengths of electromagnetic radiation
- 8. the actual brightness of an object such as a star
- 10. a small hot dim star that is left over center of an old sun like star
- 12. a collection of stars dust and gas bound together by gravity
Down
- 1. space and all the matter and energy in it
- 2. magnitude a measure of how bright a star would be if there were seen from a standard distance
- 5. the brightness of a star as seen from earth
- 7. year the distance that light travels in a year; about 9.46 trillion km
- 9. a gigantic explosion in which a massive star collapse and throws it out of layers into space
- 11. diagram Hertzsprung Russell diagram of a graph that shows the relationship between a star surface temperature and absolute magnitude