Each day we feature a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer. The unusual geometry of this stellar nebula creates somewhat of a mystery. It has been speculated that the central stars create a pair of jets that precess like a spinning top. These jets might throw gas into a thick disk which we see here edge on - so that it appears to us as a rectangle. The nebula emission is also unusual in that some of the infrared light it emits might be associated with unusual carbon-containing molecules.
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