Bipolar Nebula

Calabash Nebula (Rotten Egg Nebula)

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Calabash Nebula, more famously known as the Rotten Egg Nebula, is a bipolar protoplanetary nebula located in the constellation Puppis. The nebula lies at an approximate distance of 4,200 light years from Earth. Its official designation is OH 231.8+4.2.

The Calabash Nebula is about 1.4 light years long and has a radius of 0.7 light years. With an apparent magnitude of 9.47, it can only be seen in telescopes.
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Butterfly Nebula

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The Butterfly Nebula is a bipolar planetary nebula located in Scorpius. It lies at a distance of 3,800 light years from Earth. Named for its resemblance to a butterfly, the nebula has a wingspan that stretches across three light years. It is sometimes also called the Bug Nebula. It has the designation NGC 6302 in the New General Catalogue.
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Ring Nebula (M57) in Lyra

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The Ring Nebula, or Messier 57, is a famous planetary nebula located in Lyra constellation, south of Vega, the fifth brightest star in the sky.

The nebula was formed about 4,000 years ago, when the central star, a red giant, ejected a shell of ionized gas in the final stage of its evolution before becoming a white dwarf.

M57 is classified as a bipolar nebula, one whose equatorial rings visibly enlarge the nebula’s structure and give it a symmetric bi-lobed appearance. It is often confused with the Helix Nebula in Aquarius, another famous planetary nebula that has the appearance of a celestial eye.
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