Why is the regolith light-colored in the highlands, while darker in the maria?
A. The highland regions receive more sunlight than the maria.
B. The highland regolith is younger, and therefore lighter in color.
C. Lunar regolith is the same color everywhere, but the maria reflect less light.
D. The regolith in the maria has a different mineral composition.
Answer: D
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One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gasis moving TOWARDS us at 200km/s, what will we detect?
a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.
A day at the north pole of Uranus lasts:
A) about 7 hours. B) about 8 hours. C) about 21 years. D) about 42 years. E) about 84 years.
Our universe will end in a big crunch
Indicate whether the statement is true or false
Olbers's paradox is solved in part by the fact that the universe is neither infinitely large nor infinitely old
Indicate whether the statement is true or false