The moon's gravity is a sixth as strong as the earth's, so Chang'e-4's experiment was a test: would the earth plants know which way was up on the moon?
These quantum jumps can test Newton's theory of gravity - and any variations from it - with unprecedented precision.
这样的量子跃迁能够以前所未有的精度验证万有引力——以及所有的推论。
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The differences in the frequencies - which are proportional to energy - of each of these transitions will be an incredibly sensitive test of gravity at the microscopic scale.