Puragra Guhathakurta of the University
of California at Santa Cruz explains just
how crowded M15 is.

"Represent every star with a pea..."
a sun the size of a pea

"...the distance from the sun to the nearest star would be ten kilometers."
Peas 10km apart

"In a cluster, the peas are separated by one kilometer ..."
1km apart

"...in M15, the distance between peas shrinks to 100 meters."
Peas 100m apart

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