The greater Eagle emission nebula, tagged M16, lies about 6500 light years away, spans about 20 light-years, and is visible with binoculars toward the constellation of Serpens.

• 老鹰星云及其周围的发射星云合称为M16，大小约为20光年，距离我们约有6500光年远，用双筒望远镜可在北天的巨蛇座内找到它。