Sufficiently close-in planets inevitably wind up tidally locked to their stars, like the moon is to Earth. And since we're a lot better at observing close-in pl

Sufficiently close-in planets inevitably wind up tidally locked to their stars, like the moon is to Earth. And since we're a lot better at observing close-in planets due to their small orbital periods, a helluva lot of currently known planets are tidally locked.