Hubble’s latest picture in its series of images of dying stars is one of its most remarkable.
Like many other so-called planetary nebulae, IC 4406 exhibits a marked degree of symmetry; the left and right halves of the Hubble image are very nearly mirror images of each other.

Astronomers say that if they could fly around IC4406 in a starship, they would see that the gas and dust form a vast donut of material streaming outward from the dying star.

They have dubbed it “the retina” after the similarity of the dust lanes to blood vessels in the eye.