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