Astronomy Crossword

2. 300,000 kilometer per second
6. low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula.
7. The core of a super nova that is so dense
8. active young galaxies w/black holes in the center
10. a huge bulge in the middle and arms that spiral outward
13. measure of the amount of light a star gives up
14. a round or flattened ball with only older stars
15. a luminous point in space made of contracting gas and dust
16. the remaining core from a supernova that nothing can escape from.

1. A very large star that is even brighter than a giant
3. the range of wave lengths that stars emit
4. when a star that suddenly increases greatly in brightness because of a explosion that ejects most of its mass
5. no regular shapes and having bright young stars
9. A very large star of high luminosity and low surface temperature.
11. distance light can travel in one year
12. a huge group of single stars and star systems were dust and gas bond together by gravity