[ExI] The Great Silence again

Keith Henson hkeithhenson at gmail.com
Sat Apr 30 16:36:22 UTC 2011

A light sail can hover.  It takes active control since both the light
pressure and gravity fall off on a 1/R^2.

If you hang a hemisphere of light sails around a star, the light more
or less goes one way and the star, gravitationally coupled to the
light sails, goes the other.


On Sat, Apr 30, 2011 at 8:38 AM, Anders Sandberg <anders at aleph.se> wrote:
> One problem I see with our starmoving scheme is keeping the Dyson cloud in
> orbit. When it reflects the star's light it will also tend to expand/move
> ahead, and we need to restore it to it's original position relative to the
> star. That seems to require some work.
> A statite will be kept in place by gravity, but that only works for a ring
> around the star, not a whole shell. Is there any analysis of closed static
> orbits for reflectors reflecting in a particular direction?
> --
> Anders Sandberg,
> Future of Humanity Institute
> Philosophy Faculty of Oxford University
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