Stars

5. - Found in the halo and bulge and contain even smaller amounts of heavy elements
7. - Stars that have periods of pulsation between 1.5hours and 1.2days and on average have the same luminosity
8. - Astronomical Unit, distance from Earth to Sun
10. - Made up generally of older, red stars
12. - Stars with pulsation periods between 1 and 100days and luminosity increases as much as 100 times from the dimmest star to the brightest
13. - A spherical region where globular clusters are located
14. - Light year, a unit for distance

1. - Found in the disk and arms and have small amounts of heavy elements
2. - Made up of younger stars and a disk that forms from neutral hydrogen gas.
3. - Birthing area of stars that is subject to gravitational tags and giving it its shape
4. - Spiral regions of alternating density, which rotates in a rigid motion
6. - A blackhole in the middle of most galaxies
9. stars - Huge spherical star clusters located above or below the plane of the galactic disk, used to estimate distance of clusters by using these stars.
11. - Any of the very large groups of stars and associated matter found throughout the universe