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Using JWST data, an international team has, for the first time, successfully mapped the climates of two rocky exoplanets with masses similar to Earth’s. These two planets, TRAPPIST-1b and TRAPPIST-1c, belong to the iconic TRAPPIST-1 planetary system, discovered ten years ago.
The TRAPPIST-1 system, located about 40 light-years away, contains seven rocky planets orbiting a small, cool red dwarf star known as TRAPPIST-1
The two planets are likely devoid of atmospheres, as the temperature difference between day and night exceeds 500°C. TRAPPIST‑1b has a very hot dayside (about 490 K) but no detectable glow from its nightside, suggesting it’s a dark, airless world. TRAPPIST‑1c is cooler (about 369 K) with a similarly cold nightside, which could mean it either has a thin, oxygen‑rich atmosphere or a shiny, airless surface.