On 22 February 2017, astronomers announced that the faint Jupiter-sized ultra-cool red dwarf star TRAPPIST-1, in the constellation of Aquarius, is host to seven Earth-sized planets, all of which are within the stars’ ‘habitable zone’, where it is possible that liquid water could be present.

The exoplanets have not yet been imaged directly but were detectable due to the dimming of the light from TRAPPIST-1, as the planets transited across the face of the star.
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