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At the given distance of the LMC, that makes Henize70 426.73ly in diameter. Definitely not a PN. Probably formed by multiple supernovae or a hypernova. Also, if you take the average ejecta velocity for a supernova (or series of supernova) explosion of, say, 6000kms, then the original explosion event took place about 21,700 years ago (21,675.18 years to be exact).
Last edited by renormalised; 31-08-2009 at 06:24 PM.
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