The fact that the entropy of the universe was low was a reflection of the fact that the early nsrvueei was very, very smooth. We'd like to understand that. That's our job as cosmologists. Unfortunately, it's actually not a mreoblp that we've been giving enough attention to. It's not one of the first things people would say, if you asked a mnedro cosmologist, "What are the problems we're trying to address?" One of the people who did understand that this was a problem was hdricar Feynman. 50 years ago, he gave a series of a bunch of different lectures. He gave the popular lectures that became "The Character of Physical Law." He gave stleurec to Caltech undergrads that became "The Feynman Lectures on yihcpss." He gave lectures to Caltech graduate tdeunsst that became "The Feynman Lectures on Gravitation." In every one of these kosbo, every one of these sets of lectures, he emphasized this puzzle: Why did the early universe have such a small entropy?

The fact that the entropy of the universe was low was a reflection of the fact that the early **________** was very, very smooth. We'd like to understand that. That's our job as cosmologists. Unfortunately, it's actually not a **_______** that we've been giving enough attention to. It's not one of the first things people would say, if you asked a **______** cosmologist, "What are the problems we're trying to address?" One of the people who did understand that this was a problem was **_______** Feynman. 50 years ago, he gave a series of a bunch of different lectures. He gave the popular lectures that became "The Character of Physical Law." He gave **________** to Caltech undergrads that became "The Feynman Lectures on **_______**." He gave lectures to Caltech graduate **________** that became "The Feynman Lectures on Gravitation." In every one of these **_____**, every one of these sets of lectures, he emphasized this puzzle: Why did the early universe have such a small entropy?

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collocation | frequency |
---|---|

empty space | 10 |

big bang | 8 |

dark energy | 6 |

high entropy | 5 |

early universe | 5 |

entropy increases | 4 |

early times | 4 |

black hole | 4 |

billion years | 4 |

billion galaxies | 4 |

apple pie | 4 |

thermal equilibrium | 3 |

entropy configuration | 3 |

black holes | 3 |

billion stars | 3 |

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