Trappist-1b is the closest planet to Trappist-1 and also probably the least likely to be inhabited by life. We know it is a rocky planet, and that it is very hot, most likely possessing a thick atmosphere like that of Venus, either made of carbon dioxide or water vapor, both of which are excellent greenhouse gasses. Basically it's like Venus only bigger, even hotter, and with an even thicker atmosphere.
Trappist-1e is, in my opinion, the best candidate for extraterrestrial life we know of. Unlike Trappist-1d, it is actually denser than Earth. This is great news, because the problem with other planets in the Trappist-1 system, such as Trappist-1d, is that they are not very dense, implying that they have ridiculous amounts of their mass in water. Trappist-1e, however, is thought to have an amount of water similar to that of Earth. This means it most likely isn't a complete water world. (If it is, it's probably a shallow one) It most likely has a solid, rocky surface, with at least some water on it. I'm not going to jump to conclusions about whether or not Trappist-1e has life on it though. Yes, this planet could be habitable, but just because a planet is habitable doesn't mean it is inhabited. But if it does have life on it, I think it is probable that Trappist-1d does as well. This is because considering how close to each other the planets in this system are, it is incr...
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