New calculations of the composition of TRAPPIST - 1f, the fifth planet from the star, suggest a relatively thin layer of water (still far deeper than anything found on Earth) gives way to ice VI and ice VII, two different forms of ice that can form under high pressures. (sciencenews.org)
He estimates that on the fifth planet, TRAPPIST - 1f, liquid water extends down about 200 kilometers — about 20 times deeper than the Mariana Trench on Earth. (sciencenews.org)
About 561 light - years away, the fifth planet discovered in this dwarf - star system circles its star's habitable zone. (discovermagazine.com)