Hundreds of Venus-like planets could soon help determine why some worlds become sweltering greenhouse hellscapes while others remain capable of supporting life. Without knowing the true rotation rate, scientists trying to model an alien planet’s climate are missing a fundamental piece of information. Just as importantly, many of the planets PLATO finds will orbit relatively bright stars. “Exo-Venus candidates, which are Venus-like planets in other solar systems, are going to play a huge role in filling in that knowledge gap.” If scientists examine 100 Venus-like worlds and discover that most are also extremely slow rotators, that could indicate slow rotation is an important factor in turning planets into greenhouse worlds.