A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
A) gas at the same temperature as the other jar.
B) the hotter gas.
C) gas at very high pressure.
D) the cooler gas.
E) the exact same gas as the other jar.
Question 2
On an H-R diagram, stellar radii ________.
A) decrease from left to right
B) are greatest in the lower left and least in the upper right
C) increase diagonally from the lower left to the upper right
D) are impossible to determine
The Moon passing in front of the Sun, from the STEREO-B spacecraft.
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