Compared to the event horizon, the photon sphere of a black hole is
A) nearer the singularity.
B) farther from the singularity.
C) at the same location.
Answer: B
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On the Moon, the acceleration of gravity is g/6. If a pendulum has a period T on Earth, what will its period be on the Moon?
A) T B) T/ C) T/6 D) 6T E) T/3
The density wave theory attempts to explain why the spiral arm structure persists over a long time
Indicate whether the statement is true or false
The Moon's redness during a lunar eclipse is due to
A) light of lower frequencies reflected from the Moon. B) excess infrared radiation. C) an optical illusion. D) refracted light from Earth's sunrises and sunsets. E) none of the above
Differences in apparent magnitude correspond to ratios of ________.
A. luminosity B. brightness C. distance D. temperature E. mass