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Home The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist’s concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system. (NASA/JPL-Caltech) The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist's concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system. (NASA/JPL-Caltech)

The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist’s concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system. (NASA/JPL-Caltech)

The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist's concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system. (NASA/JPL-Caltech)

The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist’s concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system. (NASA/JPL-Caltech)

Imagine standing on the surface of the exoplanet TRAPPIST-1f. This artist’s concept is one interpretation of what it could look like. (NASA/JPL-Caltech)