[AR] Re: Freeman Dyson, RIP
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Tue, 10 Mar 2020 14:44:27 -0400 (EDT)
On Tue, 10 Mar 2020, ken mason wrote:
The time scale for energy propagation out is long, thousands of
years if I recall correctly...
I've always heard/read that it takes millions of years for core energy to
'wiggle' its way to the surface.
Checking around a bit, there are a wide range of numbers quoted for this.
Simplistic calculations say it's *at least* thousands of years, but the
assumptions you make can add two or perhaps three more zeros to that.
It's not a number that interests the astrophysicists very much, so nobody
with detailed knowledge seems to have made a serious attempt to calculate
an authoritative number, and there is no obvious way to measure it within
one NSF funding cycle. :-)
Henry
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