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Three planets in the system orbit within the habitable liquid water zone. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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TRAPPIST-1 hosts seven Earth-sized rocky planets around an ultracool star

Three planets in the system orbit within the habitable liquid water zone

Located 40 light-years away in the constellation Aquarius, TRAPPIST-1 is an ultracool red dwarf star orbited by seven Earth-sized terrestrial planets. Three of these planets reside within the circumstellar habitable zone, where surface temperatures could potentially allow liquid water to exist.

17-098-Kepler-90 MultiExoplanetSystem-20171214 — NASA/Wendy Stenzel · Public domain · source

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NASA Science

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Tags: trappist-1, exoplanets, habitable zone

TRAPPIST-1 hosts seven Earth-sized rocky planets around an ultracool star: the short answers

Where does this come from, and can I check it?: Three planets in the system orbit within the habitable liquid water zone. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.