Norwegian Arctic explorer.
See also: http://id.loc.gov/authorities/names/n50053375
The graph displays the other subjects mentioned on the same pages as the subject "Nansen, Fridtjof, 1861-1930". If the same subject occurs on a page with "Nansen, Fridtjof, 1861-1930" more than once, it appears closer to "Nansen, Fridtjof, 1861-1930" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.