Wednesday, November 23, 2011

REALLY BIG NUMBERS

The  Alpaca Fiber Felted Brain 

A 20 year-old male has around 176,000 km of myelinated axons in his brain.  This sounds like a very large number, but isn't so big in similar contexts. 

A typical Alpaca fiber is 20 Microns in diameter, 10 cm long, and has a 
volume/weight of   10x(20E-8)^2 = 4E-13 cm3 or g,  assuming a density of 1.0 g/cm3.  A typical blanket weighs 2,000 g and contains 
    2000/4E-13 = 5 E 15,  Five Quadrillion fibers.  They would have a length of 5 E 16 cm or a combined length of 5 E 11 km or 500 billion km.   This is about 1/20 light year

The nearest star, Proxima Centauri, is 4.5 light years away.  

It would take the fibers laid end to end from about 90 alpaca fleeces to reach this star.  

9.5 E 12 km = 1 light year.  

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