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got a difficult physics question for homework not sure how to answer it

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Homesick astronaut: An astronaut on the moon gazes up at the narrow crescent earth. Her beloved lives in southern California, where it is night.
a) Even if the dark side of the earth had no electric lighting, it would not be completely dark because of the reflected moonlight (just as the “old moon in the new moon’s arms” is not completely dark because of reflected earthlight). If there were a sudden blackout in southern California, would the astronaut notice?
b) The astronaut’s beloved likes light shows at his parties, and has a 10W green laser (laser power ratings are for the radiated power, not the input power as for lightbulbs) with 1mrad beam divergence. He has trained it on the moon and is turning it on and off in a Morse (ITU) code pattern · − · · · · − · · · − · ·−. Will she notice?
asked 12 years ago in Physics by anonymous

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