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Current findings suggest that the universe is flat. What is an implication of this finding? ...
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Given the possible sources of gravitational waves in the universe, would you expect them to have short wavelengths or long? ...
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Do binary stars (double-star systems that orbit about a common center of mass) radiate gravitational waves? Why or why not? ...
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From our frame of reference on Earth, objects slow to a stop as they approach black holes in space because time gets infinitely stretched by the strong gravity near the black hole. If astronauts accidentally falling into a black hole tried to signal back to Earth by flashing a light, ...
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In the astronomical triangle shown in Figure 36.14, with sides defined by light paths, the sum of the interior angles is greater than 180°. Is there any astronomical triangle whose interior angles sum to less than 180°? Figure 36.14: ...
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Do you age faster at the top of a mountain or at the mountain's base? ...
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Light does bend in a gravitational field. Why isn't this bending taken into consideration by surveyors who use laser beams as straight lines? ...
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Cite three main advantages of fission power. Cite four main drawbacks? ...
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When only a few photons are observed, classical physics fails. When many are observed, classical physics is valid. Which of these two facts is consistent with the correspondence principle? ...
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Light will not pass through a pair of Polaroid sheets when they are aligned perpendicularly. However, if a third Polaroid is sandwiched between the two with its alignment halfway between the alignments of the other two (that is, with its axis making a 45° angle with each of the other...

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