A squid-like apparition, this nebula is very faint, but also very large in planet Earth's sky, A new investigation suggests Ou4 really lies within the emission region SH2-129 some 2,300 light-years away. Consistent with that scenario, the cosmic squid would represent a spectacular outflow of material driven by a triple system of hot, massive stars, catalogued as HR8119, seen near the centre of the nebula. If so, this truly giant squid nebula would physically be nearly 50 light-years across.
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The Cat's Eye Nebula--Hubble Image