Back then, there were two major rival theories about the origin of the Universe: the Big Bang theory and the Steady-Statemodel of the Universe.
当时,对宇宙的起源有两个主要的对立理论:宇宙大爆炸理论,稳态宇宙模型。
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For the inside part, steady statemodel will be used through the Energy Balance Theory, considering the changes of fluid temperature along the way and the thermal influence between the two pipes.