central bulge (of a galaxy)

*magnetic resonance imaging (MRI)

dark matter

massive compact halo object (MACHO)

density wave

microlensing

disk (of a galaxy)

Milky Way Galaxy

far-infrared

near-infrared

flocculent spiral galaxy

rotation curve

galactic nucleus

RR Lyrae variable

galaxy

Sagittarius A

globular cluster

self-propagating star formation

grand-design spiral galaxy

spin (of a particle)

H I

spin-flip transition

halo (of a galaxy)

spiral arm

interstellar extinction

21-cm radio emission

interstellar matter

weakly interacting massive particle (WIMP)

Local Bubble

winding dilemma