Carbon dioxide and water molecules in the atmosphere will absorb:
a. infrared light.
c. ultraviolet light.
b. visible light.
d. radio waves.
A
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How long is one Hubble time?
a. 1/4 the age of the Universe b. 1/2 the age of the Universe c. the age of the Universe d. double the age of the Universe
If is about 30 
?
A. Roughly zero
B. Roughly 
/30
C. Roughly /1.4
D. Roughly
E. Roughly 1.4
F. Roughly 30
T. Other (specify)
Why didn't the Viking landers find organic molecules in the soil on Mars?
A) The Martian soil contains perchlorate, which destroyed the organic molecules when heated during the experiments. B) There are no organic molecules on Mars because they were carried away by the solar wind. C) The Viking landers were not designed to detect organic molecules. D) Organic molecules exist too deep below the surface of Mars to be detected.
Based on the H-R diagram shown above, what is the approximate luminosity of a main-sequence M star?
A) 10?6 times that of the Sun B) 0.01 times that of the Sun C) 1 times that of the Sun D) 10 times that of the Sun