Ice planet

• 1. 冰行星: Ice Planet Hoth
• 2. 冰态巨行星: icy-giant planet

• 1.这两组行星的构成物质根据熔点分为三类：气体、岩石和冰。
  The substances that make up both groups of planets are divided into three groups—gases, rocks, and ices—based on their melting points.
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• 2.然而，如今的类地行星与木星不同，几乎没有轻气体和冰。
  However, unlike Jupiter, the terrestrial planets today are nearly void of light gases and ices.
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• 3.他们观测到的化学特征与水冰高度吻合，这类水冰遍布整颗小行星。
  The chemical signature they saw was a good match for water ice, which they found all over the asteroid.
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