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