Atmospheric refraction makes the daylight hours a bit
A) longer.
B) shorter.
C) longer in summer but shorter in winter.
Answer: A
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The choices describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days B) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours
The source of Earth's internal energy involves
A) kinetic energy. B) potential energy. C) radioactivity. D) the Sun.
What is cosmic background radiation evidence for?
a. Dark matter. b. Dark energy. c. The Big Bang theory. d. The theory of relativity. e. Neutrino oscillations.
Why can't we be certain that the Andromeda Galaxy exists today?
What will be an ideal response?