HiRISE captured dry Ice Pits lined with gold-coloured dust on Mars. Around the south pole, toward the end of Martian summer,a section of the vast carbon dioxide ice cap starts to evaporates due to warm weather & these pits form. The expansion happens when the ice sublimates directly into gas. via /r/spaceporn http://bit.ly/2GN5BXy
via Tumblr http://bit.ly/2Gx6WCi
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