Planets can be billions of times fainter than the star around which they orbit and are typically located at separations smaller than 1/2000th the angular size of the full moon from their star.

• 行星的亮度可能只是它们所围绕运行的恒星亮度的几千万分之一，而且这些行星与恒星的分离通常在与恒星满月时的视角1/2000还小的角度。