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Ch 23 Milky Way Pt 3

Vocabulary

TermDefinition
Conservation of Angular Momentum ensures that a spinning gas cloud must spin faster as it contracts
Centripetal Force force directed toward the center of a body's orbit
Kepler astronomer who first stated laws of planetary motion
Keplerian Motion says that the orbital velocity of an object should decrease the further away it is
Rotation Curve plot of the orbital speed of disk material in a galaxy vs. its distance from the center
Dark Halo region of a galaxy beyond the visible halo where dark matter is believed to reside
Dark Matter mass in galaxies whose existence we infer from rotation curves and other techniques
Rubin influential astronomer in the study of galactic rotation curves and the presence of dark matter
Stellar-Mass Black Hole formed by the gravitational collapse of a massive star
Supermassive Black Hole a mass millions or billions greater than that of the Sun in many galaxies' centers
Gravitational Lensing effect induced on the image of a distant object by a massive foreground object
Sagittarius A Star the supermassive black hole at the center of the Milky Way galaxy
Accretion Disk flat disk of matter spiraling down onto the surface of a neutron star or black hole
Solar Mass the mass of the Sun used as a unit of mass
Galactic Nucleus small, central, high-density region of a galaxy
Created by: john_bailey720
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