1) Impact crater on Mercury 2) Norwegian surname 
Bjornson, Bjørnson, Bjørnsen, Björnsson and variations can refer to the following people: ...[crater] Bjornson is a crater on Mercury. It has a diameter of 88 kilometers. Its name was adopted by the International Astronomical Union in 1985. Bjornson is named for the Norwegian playwright and poet Bjørnstjerne Bjørnson, who lived from 1832 to 1910. ...
1832–1910, Norwegian poet, novelist, and playwright: Nobel prize 1903.