Across
- 2. the milky way galaxy formed by gravitational collapse of a single large spinning cloud of gas
- 4. The milky way Galaxy and other large galaxies formed mostly by collisions
- 6. Part of the Galaxy including all matter in a spherical distribution around the center
- 8. Spherical region of a sprial Galaxy containing a thin scattering of stars.
- 9. Neither emitting nor absorbing light
- 11. The combinedcalibration of distance indicators used by astronomers to find the distance to remote galaxies
- 12. The process by which the birth of stars compresses the surrounding gas clouds
- 14. The procedure for finding the mass of a Galaxy from it's rotation curve
- 15. Galaxies that is a source of excess radiation , usually radio waves , x-rays and gamma rays
Down
- 1. Low-density extension of the halo of a galaxy
- 3. A bright blue galaxy in which many new stars are forimg , it' thought to be cause by collisions between galaxies.
- 5. Objects used to map sprial arms
- 7. A Galaxy that has a wooly appearance
- 10. A Galaxy that is a strong source of radio signals
- 13. indicators Object of known brightness that astronomers use to find distance