<a href="http://www.newscientist.com/article/mg20026875.600-burrowing-black-holes-devoured-first-stars-from-within.html">http://www.newscientist.com/article/mg20026875.600-burrowing-black-holes-devoured-first-stars-from-within.html</a><br>
<br>Note the time scale - somewhat less than a million years for the<br>example.  It shouldn't be too hard (!) to change the black hole mix<br>to get whatever length of time was required.<br><br>Enamel<br><br>