迄今为止所发现的454颗系外行星中，多颗都具有极近椭圆形的轨道，这意味着行星与它们的母星并不总保持相同距离。
Many of the 454 exoplanets discovered to date have highly elliptical orbits, meaning the planets are not always the same distance from their parent star.
母斑也会表现为一小片小的椭圆形斑点，而被误认为是粉刺。
The "herald" patch may also appear as a cluster of smaller oval spots, and be mistaken for acne.
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