In one of my children's science books was a table of planetary data that I enjoyed perusing; but in the space for Pluto's rotation period it said "unknown". The intrigue of that single word spurred a lifelong interest in astronomy, with a strong planetary emphasis. Happily -- over 40 years later -- I now have that info: about 6 days 9 hrs. And soon I'll get to see the icy worldlet close up, when New Horizons arrives there.
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