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

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For the earth’s seasonal temperature at a particular location described by

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Cool stars emit a great deal of ultraviolet radiation that you can't see, and hot stars emit plenty of infrared radiation

Indicate whether the statement is true or false

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