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cover of episode Things You Thought You Knew – The Geometric Universe

Things You Thought You Knew – The Geometric Universe

2024/4/9
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Chuck Nice
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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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Neil deGrasse Tyson: 宇宙中大多数天体都是球形或近似球形,这是由物理定律决定的。引力是主要因素,它使物质聚集到中心,形成球形是最有效的物质分布方式。表面张力也起作用,例如在失重环境下,液体形成球形。快速旋转的天体是一个例外,它们由于离心力而变得扁平。地球、月球、太阳以及大多数行星和恒星都是球形,这体现了宇宙中普遍存在的物理规律。此外,地球的倾斜导致了黄道与天赤道的夹角为23.5度,从而产生了四季变化。天球坐标系也由于地球的岁差而发生变化,这使得天体坐标需要考虑观测日期。 Chuck Nice: 我同意Neil deGrasse Tyson的观点,宇宙中大多数天体都是圆的或球形的。从日常生活中观察到的现象,例如肥皂泡、橙子等,都可以说明球形是自然界中的一种常见形状。此外,我还注意到,在寒冷天气中,鸟类会将自己蜷缩成球形以保持体温,这也可以看作是自然界中趋向于球形的例子。

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What is the Sun’s ecliptic? Neil deGrasse Tyson and comedian Chuck Nice break down the things you thought you knew about spheres in the universe, navigating the sky, and taking spacecraft out of orbit. 

NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here:https://startalkmedia.com/show/things-you-thought-you-knew-the-geometric-universe/)

Thanks to our Patrons Will Farmer, David Robertson, Andrii Snihyr, Michael de Boeve, Patricia A Elvin, Dade Bloomfield, Ahmed Dawod, Oenomaus Williamson, Marek Król, and Elizabeth Terveer  for supporting us this week.