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.

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