TRAPPIST-1d is a rocky, Earth-like planet, meaning that it is roughly the same size and mass as our home.
TRAPPIST-1d has a radius that is about three quarters the size of Earth, and a comparable mass just a little heavier. Planets like this are of intense interest to astronomers because they are so like our own. In many respects, this planet is the most habitable exoplanet found so far. It is not large enough to retain light gasses like hydrogen and helium, which could destroy nascent life and it is comfortably situated in the star’s habitable zone.
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