The core could be very, very rich in hydrogen (a water ingredient) or totally dry.
地核中可能有巨量的氢(水分子的一种组分)或者完全干燥。
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The waves of damp and dry conditions suggest water is created on the moon every day, when hydrogen nuclei in the solar wind slam into oxygen-rich silicate minerals on the moon's surface.
Mars is too dry and poor in oxygen, Venus far too hot, and so is Mercury, and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres.