Based on this diagram, "red sequence" galaxies are ________ than "blue cloud" galaxies.
A) redder and more luminous
B) redder and more distant
C) cooler and more distant
D) more luminous and older
A) redder and more luminous
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Most of the energy of the supernova is carried outward via a flood of:
A) gamma rays. B) helium nuclei. C) protons. D) neutrinos. E) positrons.
How do the atmospheres of the Moon and Mercury compare?
A) Mercury's is much denser, like Venus, with much carbon dioxide. B) They are about equal, each only 1% as dense as ours. C) The cooler Moon retains a thicker nitrogen atmosphere. D) As no spacecraft has yet landed there, no information exists about Mercury's. E) Neither body has a permanent true atmosphere.
What was the Shoemaker-Levy 9 impact?
A) the 1994 impact of a chain of comet fragments into Jupiter B) the impact thought to have wiped out the dinosaurs C) the impact that created the Moon's largest crater D) the ninth impact witnessed by astronomers in modern times
A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 ×10-26 kg,
and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many molecules strike the umbrella each second? Assume that the wind blows horizontally so that the gravitational force exerted on the air molecules can be neglected.