The ice caps, first observed by Giovanni Cassini in 1666, immediately raised tantalizing questions. Are they made of water ice like the giant glaciers that smother Antarctica?

 
  • 1666年,由喬萬(wàn)尼·卡西尼發(fā)現的冰冠立即引發(fā)了一些問(wèn)題:它們也是由像包圍著(zhù)南極洲的巨大的冰川一樣的冰水構成的嗎?
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