Puragra Guhathakurta of the University
of California at Santa Cruz explains just
how crowded M15 is.
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| "Represent every star with a pea..." |

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| "...the distance from the sun to the nearest star would be ten kilometers." |

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| "In a cluster, the peas are separated by one kilometer ..." |

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| "...in M15, the distance between peas shrinks to 100 meters." |

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