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TRAPPIST-1 is a planetary system approximately 40 light-years away from Earth. It hosts seven Earth-sized exoplanets designated TRAPPIST-1b, c, d, e, f, g, and h, all of which have masses and sizes comparable to Earth, Venus, and Mars. Unlike our solar system's planets, the TRAPPIST-1 planets orbit much closer to their star, which emits less light due to its smaller and cooler nature. Notably, some of these planets reside in the Goldilocks zone, the region around a star where conditions might be just right to support life.
Furthermore, the TRAPPIST-1 system is around 7.6 billion years old—significantly older than our solar system, which opens a window for the possible development of life if these planets possess the right conditions, particularly atmospheres.