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One fermi is one femtometer, which is equal to 10-15 meters, or 0.000,000,000,000,001 meters.
1 Fermi is a quadrillionth of a metre ie 1 Fermi = 10-12 metre.
it is a unit of length that is equal to 10-15meters (one femtometer) which is used in nuclear physics. it is similar to the diameter of a proton.
fermi
I am sure there are lots of questions from Fermi, but I'll bet you mean the Fermi Paradox, which asks, "If there are ETs, where are they?" What he meant by this, is that the time to completely colonize the galaxy is very small compared to the age of the galaxy, so there should be ETs here if they exist at all!" So where are they--or alternatively what is wrong with this idea? For more on this please search "Fermi Paradox".