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cover of episode Time and The Universe, with Charles Liu

Time and The Universe, with Charles Liu

2024/9/27
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StarTalk Radio
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Charles Liu
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Chuck Nice
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Chuck Nice：时间既是朋友也是敌人，它标志着生命的流逝。对时间的感知取决于个人生活方式，积极生活的人会感觉时间充裕，消极生活的人则会感到时间紧迫。爱因斯坦关于时间膨胀的思想实验令人着迷，它在物理层面有体现，理论上可以实现时间旅行，让人永葆青春。 Charles Liu：根据爱因斯坦的相对论，时间是一个维度，与空间维度共同构成时空。时间只能向前流动，不能倒流。大爆炸是时间开始的时刻，宇宙从一个极小的点开始膨胀。 大爆炸并非发生在空间中的爆炸，而是空间本身的膨胀。我们现在就处于宇宙开始膨胀的那一点，因为宇宙空间本身是在大爆炸中产生的。大爆炸后，宇宙经历了快速膨胀，能量分布均匀，随后引力作用导致能量聚集形成星系等结构。黑洞的形成是因为其逃逸速度超过光速，光线无法逃逸，因此看起来是黑色的。黑洞中心是奇点，具有无限密度和零体积；事件视界是光线无法逃逸的边界。黑洞周围环境会因吸积物质而发光。 宇宙的最终命运决定了时间的终结方式。如果宇宙停止膨胀并收缩，时间就会逆转；如果宇宙无限膨胀，时间会以一种平静的方式结束。

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Chapters
Charles Liu and Chuck Nice discuss the philosophical and physical aspects of time, exploring how time can be both an enemy and a friend, and how our perception of time is shaped by our experiences.
  • Chuck Nice's father said, "There is no such thing as time, there is only life."
  • Our perception of time is relative to how we live our lives.

Shownotes Transcript

Can time itself die? Astrophysicist Charles Liu is back in the hosting hot seat alongside comic co-host Chuck Nice to explore black holes, big bangs, our understanding of time and how it relates to the universe. 

NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here: https://startalkmedia.com/show/time-and-the-universe-with-charles-liu/x)

(Originally Aired December 18, 2018)

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