Twenty-two bow shocks in the outer Helix Nebula trace the progressive fragmentation of AGB shell clumps and imply a ~10,000 year timescale for their disruption into the ISM.
C.et al.A turbulent wake as a tracer of 30,000 years of mira’s mass loss history.Nature448, 780–783 (2007)
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Numerous bow shocks in the outer Helix Nebula
Twenty-two bow shocks in the outer Helix Nebula trace the progressive fragmentation of AGB shell clumps and imply a ~10,000 year timescale for their disruption into the ISM.