The heating of a planet or satellite because of friction caused by stretching due to the gravitational influence of a nearby body is referred to as _____
A) friction factorization
B) tidal heating
C) gravitational heating
D) atomic friction
B
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_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra
Fill in the blank(s) with correct word
This graph shows data collected by a gamma ray telescope. What kind of event is it showing?
A) a gamma ray burst from a distant galaxy B) a burst of gamma rays from a flare on a blue supergiant star C) a burst of gamma rays from an explosion on the surface of a neutron star D) the on and off gamma-ray light changes of a pulsar
About how many stars are visible on a clear, dark night with the unaided eye alone?
A) A few dozen B) A few hundred C) A few thousand D) Tens of thousands E) Millions and millions
Which model of the universe gives the youngest age for the present size of the universe? (Assume that the present expansion rate is the same for all of these models. The different models have different expansion histories.)
A) a recollapsing universe B) a coasting universe C) a critical universe D) an accelerating universe E) All models give the same age.