We might look for a tiny wobble in the position of a star.
我们可以期待在一颗恒星位置上的一个微小晃动。
《柯林斯英汉双解大词典》
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The majority of the more than 300 "extrasolar planets" now known were spotted by watching the tiny wobble in stars' position as enormous, Jupiter-sized planets swung around them.
Astronomers used to detect them by indirect methods, such as picking up a small wobble in the position of the star that indicated it was being pulled very slightly towards an orbiting planet.