NASA scientists have revealed that the Phoenix Mars Lander has sent back the first definitive proof that there is water ice hidden beneath the surface of the alien rust-coloured planet.
After twenty days of scratching its way through the Martian top soil, the spacecraft uncovered a bright white layer just two inches below the surface.
Four days after the white layer was first exposed to sunlight, photographs taken by the lander's on board camera showed the white surface had disappeared.
This proves, the scientists say, that the white layer was not salt as had been previously thought possible because it was melting.
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