Glowing Eye of NGC 6751. Glowing in the constellation Aquila like a giant eye, the nebula NGC 6751, is a cloud of gas ejected several thousand years ago from the hot star visible in its centre. The Hubble Telescope observations were obtained in 1998 with the Wide Field Planetary Camera 2 (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.