Travel-time to GEO (LEO vs GSO; colony-isolation tests)

The shielding requirement for human habitat is done by
putting everything but humans on the geometrical
shell.

Lightweight materials for shielding include foam and
aerogel.

Foam is usually done on the ground but could be done
in space to create some structure to say a balloon
like system.

Aerogel needs to be done on earth but could be done by
a cell or ceiling tile approach.

David

> > > are there reasons -- besides launch or
> orbit-transfer energy
> > > -- for preferring LEO to geostationary, or
> higher, orbit?
> > Yes: there's travel time to/from Earth (which is
> quite a separate
> > issue from the energy requirement)
>
> That sounds like a good point -- and it is one on
> which I am
> ignorant. Please enlighten me. How long does it take
> to travel
> from Earth to LEO vs to GEO?
>
> By the way, I have heard different figures for the
> energy. This
> recent Mike-Snead post seems to claim it is only
> double (or less):
>
http://spacefaringamerica.net/2007/12/14/response-to-reader-comments-