[ExI] The Great Silence again

[Richard Loosemore]

Stefano Vaj wrote:
> On 30 April 2011 21:06, Keith Henson <hkeithhenson at gmail.com> wrote:
>> For a non rotating Dyson sphere that's thin enough the light pressure
>> would balance the gravity from the sun.  The light pressure at the
>> distance of the earth's orbit is around 9.3 N per square km.
> 
> Now that you make me think of it, in a non-rotating Dyson sphere
> object on the internal surface would be bound to fall towards the sun,
> right? The gravity of even a relatively thick surface would hardly
> compensate...
> 
Uh, the gravity of even an infinitely dense spherical object would be 
exactly zero on the inside surface.

Gauss's law.


Richard Loosemore