Mercury's major atmospheric gas is
a. oxygen.
b. hydrogen.
c. carbon dioxide.
d. Misleading; the atmosphere is virtually nonexistent.
D
Physics & Space Science
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The letters AGN stand for
a. three spectral types of stars. b. active planet. c. active star. d. active galaxy nucleus. e. None of the other choices are correct.
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Early telescopic observers thought the lunar mare were seas of water; today we know they are not liquid water but molten basalt, long ago frozen out
Indicate whether the statement is true or false
Physics & Space Science