## Cosmic Numbers: The Numbers That Define Our UniverseOur fascination with numbers begins when we are children and continues throughout our lives. We start counting our fingers and toes and end up balancing checkbooks and calculating risk. So powerful is the appeal of numbers that many people ascribe to them a mystical significance. Other numbers go beyond the supernatural, working to explain our universe and how it behaves. In |

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### Contents

THE SPEED OF LIGHT | |

THE IDEAL GAS CONSTANT | |

ABSOLUTE ZERO | |

AVOGADROS NUMBER | |

ELECTRICITY AND THE PROPORTIONALITY CONSTANT | |

THE BOLTZMANN CONSTANT | |

THE PLANCK CONSTANT | |

THE SCHWARZSCHILD RADIUS | |

THE EFFICIENCY OF HYDROGEN FUSION | |

THE CHANDRASEKHAR LIMIT | |

THE HUBBLE CONSTANT | |

The Special Theory of Relativity | |

OMEGA | |

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absolute zero accessed January 17 amount approximately astronomer atomic weight Available Avogadro’s number beam big bang Boltzmann Boltzmann’s constant Boyle’s law caloric caloric theory carbon Cavendish century Cepheid variables Chandrasekhar CHAPTER chemical chemistry CODATA compound compute Coulomb cubic Dalton degree centigrade density described determine discovered discovery distance Doppler effect Earth Eddington Einstein electric charge electromagnetic electron elements enable entropy equations experiment formula frequency fusion galaxies gases gravitational constant gravitational force heat helium Hubble Hubble’s hydrogen idea ideal gas Kepler’s kinetic energy known Leavitt lightyears magnetic mass mathematics measure meters Michelson microstates Milky million molecules moving nebulae neutron Newton’s Nobel Prize oxygen particles periodluminosity physicist physics Planck planet pressure produced protons quantum radial velocity radiation ratio reactions recession velocities result Roentgen Schwarzschild radius scientists second law speed of light star substance technetium temperature theory of relativity there’s ultraviolet catastrophe universe volume Xray