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Ch 23 Milky Way Pt 2

Vocabulary

TermDefinition
Galactic Disk flattened region of gas & dust with active star formation dividing a spiral galaxy's halo
Galactic Bulge thick distribution of warm gas and stars around the galactic center
Galactic Center point about which the disk of a spiral galaxy rotates
Galactic Halo region extending far above & below the galactic disk, where globular clusters reside
Galactic Plane where the majority of a disk-shaped galaxy's mass lies
Metallicity abundance of elements present in an object that are heavier than hydrogen and helium
Open Cluster loosely bound collection of tens to hundreds of stars
Stellar Association a loose grouping of young stars
Molecular Cloud cold, dense interstellar cloud which contains a high fraction of molecules
21 cm Radiation radio emissions produced by cold, low-density hydrogen in interstellar space
Emission Nebula glowing cloud of hot interstellar gas from young nearby stars
Spiral Arm material in a galaxy forming a pinwheel-shaped design, beginning near the galaxy's center
Differential Galactic Rotation where the angular speed varies with location within a galaxy
Spiral Density Waves waves of compressed gas that move through the galactic disk, forming stars
Self-Propagating Star Formation when shock waves from nearby star formation and evolution trigger the next generation of stars
Created by: john_bailey720
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