The Earth-sized planets orbiting the TRAPPIST-1 dwarf star may have substanial amounts of water and could be habitable.
They had used Hubble Space Telescope, a joint of European Space Agency & NASA .
The seven Earth- sized planet ( named TRAPPIST-1b , c , d , e , f , g and h ) were discovered in 2017.
Source: http://indianexpress.com/article/technology/science/first-evidence-of-water-found-on-trappist-1-planets-4827977/
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