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astronomyvocab

QuestionAnswer
magelannic clouds small irregular galaxies that are companions to the milky way
kiloparsec a unit of distance equal to 1000pc, or 3,260ly
halo the spherical region of a spiral galaxy that contains thing scattering of stars, clusters, and amounts of gas
nuclear bulge the spherical cloud of stars that lies at the center of spiral galaxies
disk component all material confined to the plane of the galaxy
spherical component part of the galaxy including all matter in a spherical distributions around the center
spiral arms long spiral patterns of light of bright stars, clusters, gas and dust extended from center to edge of disk
high velocity star a star with large space velocity such stars are halo stars passing through at angles
rotation curve a graph of orbital velocity versus radius in the disk of the galaxy
galactic corona the low density extension of the halo of a galaxy
metals all atoms heavier than helium
population I stars stars rich in heavy metals than helium, relatively young, found in the disk of the galaxy
population II stars poor in atoms heavier than helium, old, found in the halo or globular clusters
nucleosynthesis the production of elements heavier than helium by fusion of atomic nuclei in stars
spiral tracers objects used to map the spiral arms
density wave theory proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy
flocculent woolly, fluffy, used to refer to certain galaxies that have woolly appearances
self sustaining star formation the process by which the birth of stars compresses the surrounding gas clouds and triggers the formation of more stars
sagittarius A the powerful radio source located at the core of the milky way
keplarian motion orbital motion in accord with Keplers laws of planetary motion
Created by: 100000321393201
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