Two Worlds Where the Sun Never Moves

The habitable zones of TRAPPIST-1 and the Solar System. Studies of three of the planets reveal rocky, airless worlds (Credit : NASA/JPL/Caltech)

One side is scorched to over 200 degrees, while the other is plunged into a darkness so cold it falls below minus 200. Welcome to TRAPPIST-1b and 1c, two rocky worlds that have just revealed the first ever climate maps of Earth sized planets beyond our Solar System. The James Webb Space Telescope has been watching, and what it found tells us something profound about where life might, and might not exist in our Galaxy.

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