However, the more distant galaxy Messier 81 has also been sighted with the naked eye: Christensen, Lars Lindberg; Zezas, Andreas; Noll, Keith; Villard, Ray (May 28, 2007).
2010년 4월 13일에 확인함.  However, the more distant galaxy Messier 81 has also been sighted with the naked eye: Christensen, Lars Lindberg; Zezas, Andreas; Noll, Keith; Villard, Ray (2007년 5월 28일).