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cover of episode The “Bang” in Big Bang with Charles Liu

The “Bang” in Big Bang with Charles Liu

2025/2/4
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Charles Liu
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Neil deGrasse Tyson
以主持《宇宙：时空之旅》和《星谈》等科学节目而闻名的美国天体物理学家和科学传播者。
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Brian: 我很好奇太空中巨大的气体云和星云是如何存在的,真空不应该导致所有气体均匀分散到甚至无法看见的程度吗? Neil deGrasse Tyson: 太空中的条件使得这些气体粒子倾向于分散,除非它们有聚集的理由。地球上的气体云会因为浮力等因素而聚集,但在太空中,低温环境下,重力可以克服许多运动性(或扩散性)的分散,使气体云聚集。 Charles Liu: 在太空中,当温度非常低(例如华氏零下400度)时,重力实际上可以克服许多运动性(或扩散性)的分散。太空中的湍流也导致星云呈现出条纹状、奇特和不寻常的形状。在太空中,重力将这些云束缚在一起足够长的时间,使它们能够形成恒星和行星,但总有一些力试图分散它们,从而形成美丽的星云、恒星和行星。气体云中只有一部分参与了行星的形成,而其余部分由于距离太远,没有足够的重力参与形成恒星,并可能被剥离并散布到星系中。星际云的形成和演化是一个动态的过程,取决于旋转剪切、温度和气体聚集等因素,但星际空间非常稀疏。

Deep Dive

Chapters
This chapter explores why gas clouds and nebulae don't disperse evenly in space, despite the vacuum. The discussion involves diffusion, gravity, and low temperatures in space, which allow gas particles to collect and form stars and planets.
  • Gas clouds in space don't disperse evenly due to factors like gravity and low temperatures.
  • Gravity overcomes the dispersive forces at very low temperatures, holding gas clouds together.
  • Turbulence contributes to the unusual shapes of nebulae.

Shownotes Transcript

Could slowing time increase mass? Do particles ever collide or do they just get really really close? Did anything go “bang” during the Big Bang? Neil deGrasse Tyson, co-host Paul Mecurio, and astrophysicist Charles Liu tackle these cosmic questions and more!

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