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The Butterfly Nebula, also known as the Twin Jet Nebula, is an example of a so-called bipolar planetary nebula. The object of this study, K4-47, is much less known, but may be similar in appearance. Having nothing to do with planets, a planetary nebula is (Image: ESA/Hubble & NASA/Judy Schmidt) The Butterfly Nebula, also known as the Twin Jet Nebula, is an example of a so-called bipolar planetary nebula. The object of this study, K4-47, is much less known, but may be similar in appearance. Having nothing to do with planets, a planetary nebula is a glowing, often colorful, shell of gas and dust shed into space by a dying star at high speed.