This  dramatic image from the NASA/ESA Hubble Space Telescope shows the  planetary nebula NGC 3918, a brilliant cloud of colorful gas in the  constellation of Centaurus, around 4,900 light-years from Earth.
In  the center of the cloud of gas, and completely dwarfed by the nebula,  are the dying remnants of a red giant. During the final convulsive phase  in the evolution of these stars, huge clouds of gas are ejected from  the surface of the star before it emerges from its cocoon as a white  dwarf. The intense ultraviolet radiation from the tiny remnant star then  causes the surrounding gas to glow like a fluorescent sign. These  extraordinary and colorful planetary nebulas are among the most dramatic  sights in the night sky, and often have strange and irregular shapes,  which are not yet fully explained.
NGC  3918’s distinctive eye-like shape, with a bright inner shell of gas and a  more diffuse outer shell that extends far from the nebula, looks as if  it could be the result of two separate ejections of gas. But this is in  fact not the case: studies of the object suggest that they were formed  at the same time, but are being blown from the star at different speeds.  The powerful jets of gas emerging from the ends of the large structure  are estimated to be shooting away from the star at speeds of up to  217,500 miles (350,000 kilometers) per hour.
See: https://www.nasa.gov/image-feature/goddard/2018/a-piercing-celestial-eye-stares-back-at-hubble