Vocab Crossword

2. are in the disk and arms. They have small amounts of heavy elements.
3. has spiral regions of the alternating density, which rotates as a rigid pattern.
7. located in the giant branch of the HR diagram and pulsate in brightness because of the expansion and contraction of their outer layers.
8. any of the very large groups of stars and associated matter found throughout the universe.
10. stars that have periods of pulsation between 1.5 hrs and 1.2 days.
11. the distance from earth to the sun, equal to about 150 million kilometers.
12. a spherical region where globular clusters are located.

1. are found in the halo and bulge.
4. the largest type of blackhole.
5. spiral galaxies have a bar like shape rather than having a round disk.
6. regions of stars that extend from the center of the spiral and barred spiral galaxies.
9. pulsation periods between 1 and 100 days. lightyear a unit of length used to express astronomical distances.