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At least 12 million years. Our own Sun will have probably all ready gone super nova by then.edit on 1/22/14 by proob4 because: (no reason given)
reply to post by Beavers
for all practical purposes = never
matter from the destruction of the parent star can be assumed to have had an initial velocity of sub C , and as the energy of the explosion was the primary force on it - it will subsequently decelerate
the lower its velocity drops - the greater the influence of intervening gravity wells and interstellar media will be - thus its velocity will continue to fall
But absolutely no debris