When the author says
Jun. 29th, 2011 11:51 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
the somewhat contentious use of sun-mirrors to cause fusion in The Line of Polity
he means a detail that led to the discussion that follows
But I'm not following the problem here even were that not the case.
Are you thinking there's some limit on the amount of solar energy that
could be concentrated on the sphere?