(urth) Sigh.

[Jeff Wilson]

On 1/11/2011 6:23 PM, Gerry Quinn wrote:
>
> From: "António Pedro Marques" <entonio at gmail.com>
>> No dia 11 de Jan de 2011, às 21:05, "Dan'l Danehy-Oakes"
>> <danldo at gmail.com> escreveu:
>>
>>> Urth's sun, still red, is visible in the skies of Blue.
>>
>> Space-time is a strange place. Observers may be looking at their own
>> star system far, far away.
>
> That's not really feasible for stars within a single galaxy - as far as
> I can see you'd have to be in close orbit around a really gigantic black
> hole, which would fill most of the sky.

A single black hole could not do it; by definition, it does not close 
the path of light outside its event horizon. Several in a ring might do 
it , but they would be very noticeable.

If you allow negative curvature of space and time, you can do it easily, 
but that implies interference from above by the Yesodis.

-- 
Jeff Wilson - jwilson at io.com
Computational Intelligence Laboratory - Texas A&M Texarkana
< http://www.tamut.edu/CIL >