Astronomy Picture of the Day . IC 4406: A Seemingly Square Nebula . ... Hubble Heritage Team , NASA Explanation: How can a round star make a square nebula? ... Evidence indicates that IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the cylinder from the side. ... This representative-color picture is a composite made by combining images taken by the Hubble Space Telescope last June and this January. ... The Cats Eye Nebula from Hubble . ...