On Wed, Jul 2, 2014 at 2:39 PM, <mix...@bigpond.com> wrote: That the estimates for the time taken in the Sun vary between 10000 & 170000 > years, then this tells me that such estimates are not on a very sound > footing. > If the difference is a factor of 17 for a constant star like the Sun, then > I'm > surprised that they only got if wrong by a factor of 2 for the supernova. >
Good point about the lack of precision in the estimates. I used a footnote but failed to include the original reference (it was to Wikipedia [1]). The Wikipedia article in turn references an article by NASA [2]. Eric [1] http://en.wikipedia.org/wiki/Sun [2] http://sunearthday.nasa.gov/2007/locations/ttt_sunlight.php
