Ripples in the Cosmic Microwave Background correspond to:
A) matter density fluctuations.
B) temperature fluctuations.
C) energy fluctuations.
D) fluctuations in both matter and radiation.
E) imperfections in measurement techniques or equipment.
Question 2
Which of the following is most like the rotation of stars in the disk of the Milky Way?
A) a DVD in a player
B) the planets in our solar system
C) cars moving at a constant speed on a circular race track
D) the hands of an analog clock
E) the tire of a car moving
Fertility and Population Density, 1850
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Physics - Density, Pressure, and Pascal's Principle