Of all the terrestrial planets, ________ has the largest daily temperature variation.
A. Earth
B. Mars
C. Mercury
D. Venus
Answer: C
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Length Contraction: Two stars are at rest relative to each other. A spaceship is moving between these two stars at 0.932c relative to each star. To someone in the ship, the distance between the two stars appears to be 26.4 light-years. What is the distance between the stars in their own rest frame?
A. 72.8 light-years B. 9.57 light-years C. 21.1 light-years D. 55.4 light-years
Valles Marineris is a(n)
A) large canyon on Mars. B) large valley on the Moon. C) huge series of cliffs on Mercury. D) large canyon on Venus. E) extensive plain on Mars.
In order for the cosmic microwave background to show hydrogen absorption lines at the redshift corresponding to the universe's age of 380,000 years, what condition would have been necessary?
A) There would have needed to be even warmer hydrogen clouds (which would contradict the observation of a uniform temperature in all directions). B) There would have needed to be cooler hydrogen clouds (which would contradict the observation of a uniform temperature in all directions). C) There would have needed to be ionized hydrogen (which would contradict the idea that the CMB originates at the time the universe cooled enough for protons and electrons to combine, making neutral atoms).
In the ______________ phase, ionic compounds conduct electricity
Fill in the blank(s) with correct word