[ExI] Silence in the sky-but why?

[Eugen Leitl]

On Thu, Sep 26, 2013 at 01:42:49PM -0400, Mike Dougherty wrote:

> > So we will run out of Thorium in 1.5 billion years. The Earth will become
> > uninhabitable in just 800 million years when the sun starts to run out of
> > hydrogen and starts to get off the main sequence.
> >
> 
> I would hope that in 800 million years we'd have thought of a way to reboot
> the sun if/when necessary.

When somebody is feeding you numbers, always ask where they got these.

First question: does it work in practice? Second question, as this is a
source of energy, what amount of reserves have worthwhile EROEI? 
What is the model for future energy demand growth?
 
> "Did you turn it off and turn it on again?"
> 
> Though that program might take 100 millions to start, so you know... we
> have some time to do some feasibility studies and half a billion years to
> fight about whether or not it's a good idea or if anyone will mind a few
> bird-strikes.