Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________
Fill in the blank(s) with correct word
density waves
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Which of the following is true of supermassive black holes?
A) They are found only in elliptical galaxies. B) They are not found in Seyfert galaxies. C) They can be triggered into eruptions because of tidal interactions. D) They are not affected by tidal interactions between galaxies.
This sequence of paintings shows how a large gas cloud can collapse to become a much smaller, spinning disk of gas. What law explains why cloud spins faster as it shrinks in size?
A) the law of conservation of energy B) the universal law of gravitation C) the law of conservation of angular momentum D) Kepler's third law E) Newton's second law of motion
In 1916, Einstein published his__________that described gravity as a curvature of space-time
A) relative theory of consumption B) velocity-addition formulation theory C) density functional theory D) general theory of relativity
At which lunar phase(s) are tides most pronounced (for example, the highest high tides)?
A) both first and third quarters B) both new and full Moons C) full Moon only D) new Moon only E) third quarter Moon only