Millions of years in any one place, but probably
not longer than a few hundred million for the
whole galaxy - the starbursts will happen in
different nebulae at different times. The
radiation from starbursts (at a distance) won't
affect us very much; we have not yet sheilded
ourselves from cosmic rays, and two fifths of
cosmic rays that we experience are from our own
sun. Still, we have flown out to our moon and
back. Doubtless the radiation will take its toll,
but I doubt that we on Earth will see that
significant an increase in radiation from the
Magellanic clouds, or for that matter if we were
travelling around the local group of stars.
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