Retina Nebula or IC 4406 (Picture of the Day)

Retina Nebula or IC 4406
IC 4406, which is otherwise known as Retina Nebula, is a planetary nebula about 600 parsecs (or 2,000 light years) away from Earth in the constellation of Lupus. The nebula is symmetrical which is a characteristic of a planetary nebula but the main question was about its shape. Usually planetary nebulae are circular but this one is rectangular. The studies have now shown that the nebula is like a hollow cylinder and we are viewing the nebula from the side. The star responsible for this structure is at the centre of the nebula and in a few million years only a white dwarf would be left.

Source 1

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