据国外媒体报道，美国宇航局NASA的凤凰号火星探测器得到的最新数据表明，在火星冬天的每个夜晚，水冰晶（water-ice crystals）雪花会从北极的高空稀薄..
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NASA crashed an empty rock booster into the moon to see if water-ice crystals were at the South Pole.
NASA将一枚空岩助推器撞向月球，以探测在月球南极是否存在水冰晶体。
These occur in cirrus or cirrostratus clouds, which are often composed of ice crystals and super-cooled water droplets - water that is below freezing temperature, but still in liquid form.
这些云层发生在卷云或卷层云，它们通常包含着冰晶和过冷的水滴——温度低于冻结温度却依然能保持着其液体的状态。
Polar mesospheric or Notilucent clouds are made of crystals of water ice and are the highest clouds in the Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres
极地平流层云或珠母云由冰晶形成，位于大气层的中间层，是地球大气中位置最高的云层，达到约76至85千米。
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