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天王星,太陽系行星也。諸大行星中,去日第七。上古之時,莫知其存。一七八一年,英國人赫歇爾以望遠鏡觀天,歷時數月,始得。天文代號:。
天王海王二星,異乎土木二星,除氫氦外,尚有水、氨、甲烷等。諸星之大氣,莫如其寒。其雲之成,下為水,上為甲烷。
其環之存、磁層之在、衛星之伴,有類諸星。而其轉動之軸,橫臥太虛,實屬大奇。惟四時更替、風雲之會,仍有所存。
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