What is the probable source of the day-to-day variations in Jupiter's belts and zones?
A) convection of cool ammonia ice upward
B) differential rotation and the underlying zonal flow
C) oblateness due to low density
D) thermonuclear fusion
E) Jupiter's huge magnetosphere
B
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The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model predicts that galaxies had the largest separations in the past?
A) accelerating B) coasting C) critical D) recollapsing
Suppose Earth's axis tilt was significantly greater than its current 23.5 degrees, but Earth's rotation period and orbital period were unchanged. Which statement below would not be true?
A) Summers and winters would be more severe (for example, hotter and colder, respectively) than they are now. B) The region of Earth where the Sun does not rise on the winter solstice would be larger (extending farther south) than it is now. C) The length of each season (for example, the number of days from the summer solstice to the fall equinox) would be significantly longer than it is now. D) Polaris would not be our North star.