Which of the following types of material can condense into what we call ice at low temperatures?
A) hydrogen compounds
B) hydrogen and helium
C) rock
D) metal
A) hydrogen compounds
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In units of yards, how far from the Big Bang is the Recombination period, when the gas becomes transparent to light?
a. much, much less than a yard b. about a yard c. about 5 yards d. about 10 yards
During which of the following phases of life is a star's balance of pressure and gravity out of equilibrium?
A) when it is on the main sequence B) when it is undergoing helium core fusion C) when it is a white dwarf D) when it is expanding as a red giant E) A star is never out of equilibrium.
Hurricanes derive their energy from ______________
Fill in the blank(s) with correct word
Time Dilation: Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB. What is true about these two time measurements?
A. TA > TB B. TA = TB C. TA < TB D. TA could be greater or smaller than TB depending on the direction of the motion.