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