bulge (2 facts) - The stellar population that lies within several thousand light-years of the Galactic center. The bulge is old, dense, and metal-rich.
disk (3 facts) - The central plane of a spiral galaxy, as distinguished from the halo or the nucleus., The plate-shaped component of a spiral galaxy, in which the spiral arms are found.
dust (1 kind, 6 facts) - The dust component of a galaxy, includes dark cloud
Gould Belt (4 facts) - 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 (4 facts) - the galactic halo, however, describes the spherical collection of stars forming a surrounding "shell" for our otherwise compact, discoid Galaxy., The somewhat round population of old, metal-poor stars in the Milky Way. Also, the huge entity that surrounds the disk and contains most of the Galaxy's dark matter. To distinguish between the two, astronomers call the former the stellar halo and the latter the dark halo. Most of the stellar halo lies closer to the Galactic center than the Sun, while most of the dark halo lies farther from the Galactic center than the Sun., 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 (2 facts) - The spiral arm that lies next out from the arm containing the Sun.
strangeness (3 facts) - A quantum number used in quark theory., A property ascribed to certain hyperons whose lifetimes before decay are abnormally long (about 10-8 to 10-10 seconds) relative to their rates of production (about one every 10-23 seconds). Like parity, strangeness is conserved in strong interactions but not in weak ones., A quantum number associated with the strange quark. Strangeness is conserved by the strong nuclear force.
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