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Titan's hard coating covers a soft centre


The methane-soaked surface of Titan sits on top of a rock-hard shell of water ice foating above a subsurface ocean Source: NASA / JPL.

Saturn's largest moon Titan covered in a rock-hard shell of ice. Also; one of life's essential elements abundant on early Mars, and the world's most powerful rocket blasts off carrying a spy version of the Hubble Space Telescope.

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Subjects: astronomy-space, planets-and-asteroids, spacecraft, geology, stars