| Subject |
is part of |
has inclination |
has distance from Sun |
has definition |
|---|
| bulge | galactic nucleus | | | The stellar population that lies within several thousand light-years of the Galactic center. The bulge is old, dense, and metal-rich. |
| disk | Milky Way | | | The plate-shaped component of a spiral galaxy, in which the spiral arms are found. |
| dust | disk | | | The dust component of a galaxy, includes dark cloud |
| Gould Belt | Orion arm | 10° to 20° to the galactic plane | 300 pc | The local system of stars and gas within about 300 pc of the Sun in which the greatest concentration of naked-eye O and B stars occurs. |
| halo | Milky Way | | | A spherical aggregation of stars, globular star clusters, and thin gas clouds, centered on the nucleus of the galaxy and extending beyond the known extremities of the galactic disk. |
| Perseus arm | disk | | | The spiral arm that lies next out from the arm containing the Sun. |
| strangeness | | | | A quantum number associated with the strange quark. Strangeness is conserved by the strong nuclear force. |
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