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