Across
- 3. Orbital motion in accord with Keplers laws of planetary motion
- 8. The procedue for finding the mass of a galaxy from its rotational curve
- 11. Spherical cloud of stars and star clusters
- 12. Galaxy that has arms that curve and loop around
- 13. Invisible matter that contains gravity
- 14. Extra mass that lies in an extended halo
- 15. Graph of orbital velocity versus radius in the disk of a galaxy
Down
- 1. The linear relation between the distance to a galaxy and its radial velocity
- 2. All material confined to the plane of the galaxy
- 4. Galaxy thats shape is round or ovular
- 5. Large collection of solar systems, stars, gas, and dust held together by gravity
- 6. Galaxy that does not have any specific shape
- 7. Giant space cloud of gas and dust
- 9. Halo and central bulge together
- 10. Flattenned cloud of billions of stars