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Astronomy
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Gravitational Microlensing
Grade Level
Astronomy
AST.260 Gravitational Microlensing
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Which phrase best describes the strongest simple evidence for a planet around a foreground microlens star?
A
A repeating color change every time the Moon rises
B
A permanent split of the background star into a visible double star
C
A short-lived deviation during the same temporary brightening event
D
A constant brightness level for the whole observing season
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