artificial gravity on the cheap
Getting to Mars will surely require
"artificial gravity"; but please, don't
speak of building a giant "ark", or
perhaps a huge torus filled with trees
and parks like in various sci fi.
Remember that we *do* have gravity here,
therefore lofting all the materials to build
such space-cities from Earth makes no
sense (let's wait until we have the ability
to build the big hardware on other locations
with less gravity).
The simple solution, seems to me, is to
take two (or more) reasonable-sized
space capsules, connect together with, oh,
say a kilometer of cable, and spin.
(There will probably be other synergistic
benefits to splitting up the "eggs" into multiple