Definitions for "Fermi"
a metric unit of length equal to one quadrillionth of a meter
Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)
The fermi is a non-SI unit of length that is internationally recognised. This unit was coined in honour of Enrico Fermi and is often encountered in nuclear physics as a characteristic of this scale.
Keywords:  lunar, spacecraft, crater, far, plain
Fermi is a large lunar crater of the category named a walled plain. It lies on the far side of the Moon and can not be viewed from the Earth. Thus this feature must be viewed from an orbiting spacecraft.