In 2009, NASA launched a space-based telescope named Kepler, designed specifically to stare at 150,000 stars to detect that telltale dip in light indicating exoplanet transits.

2009年，NASA 发射了一架名为开普勒(Kepler)的太空望远镜，专门用来观察15万颗恒星，以探测暗示有系外行星凌日的光线。