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Chapter 14
chapter 14 cosmic perspective
5
Astronomy
Undergraduate 1
12/17/2013

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Term
the milky way galaxy's shape and components
Definition
flat disk with spiral arms surrounding a central bulge, with a roughly spherical halo surrounding everything
Term
star motions in the milky way galaxy?
(think of the components of the galaxy)
Definition
disk stars- orbit the galaxy's center in orderly circles that all go in the same direction bobbing slightly up and down as they orbit
halo and bulge stars-swoop high above and below the disk on randomly oriented orbits
Term
interstellar medium
Definition
interstellar gas and sit fill the galactic disk, obscuring our view when we look through it
Term
what are the milky way's spiral arms
Definition
waves of stars formation that spread through our galaxy's disk. New stars
Term
What evidence do we have for a massive black hole?
Definition
stars close to our galaxy's center orbit a nearly invisible and tiny object about 4 million times as massive as our sun.
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