Bruce Murray Space Image Library

The habitable zone in the TRAPPIST-1 system

The habitable zone in the TRAPPIST-1 system
The habitable zone in the TRAPPIST-1 system The TRAPPIST-1 system contains a total of seven known Earth-sized planets. Three of them — TRAPPIST-1e, f and g — are located in the habitable zone of the star (shown in green in this artist’s impression), where temperatures are just right for liquid water to exist on the surface. Note that all 7 TRAPPIST-1 planets would easily fit within Mercury’s orbit; because TRAPPIST-1 is an ultra-cool dwarf star, its habitable zone is much closer than our Sun’s. NASA / JPL-Caltech

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