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1) the atmospheric pressure there averages just 600 pascals (0.087 psi), a figure slightly below the vapour pressure of water at its melting point; under average Martian conditions, pure water on the Martian surface would freeze or, if heated
2) We see comets, when they are near the sun. Because Comets are small and icy celestial bodies revolving around the sun. The intense solar heat vaporises parts of their icy matter and creates their characteristic illuminated tail.
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watet does not exist in liquid state on mars
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