[ExI] The Great Silence again

Keith Henson hkeithhenson at gmail.com
Tue Apr 26 22:39:59 UTC 2011

On Tue, Apr 26, 2011 at 2:37 PM, Anders Sandberg <anders at aleph.se> wrote:


> For the sun and 99% efficiency, that is 1.27*10^18 kg m/s^2. Putting that
> into F=ma gives us the whooping acceleration 6.39*10^-13 m/s^2.

I got 13 x 10^-13 m/s^2 by totaling the radiation pressure over a 1 Au
sphere at 9.15 N/km^2.

I wonder if one of us left out a factor of two.?


It takes
> about 2.8 million years to move a lightyear this way... surprisingly fast,
> actually! This way you could get out of the galactic plane within a galactic
> rotation, even if you didn't use a stellar gravity assist.
> --
> Anders Sandberg,
> Future of Humanity Institute James Martin 21st Century School Philosophy
> Faculty Oxford University
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