10-to-minus15

Center of the Milky Way

"The center of the Milky Way," image credit: NASA/CXC/UMass Amherst/Q.D.Wang et al. Click on image to learn more.

There are many ways to look at 10-15.  This power of ten is:

  • the scale of the atomic nucleus
  • the length in meters of a proton and neutron
  • the weight in kilograms of an E. coli bacterium
  • the pressure in pascals of outer space between stars in the Milky Way
  • the size or volume in cubic meters of a small grain of sand, and
  • one quadrillionth of a second, otherwise known as 1 femtosecond
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