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