The best insurance policy for the survival of the Human Race
are permanent off-world colonies. The
first one should be in earth orbit. The following discusses the advantages and
addresses the problems of this approach.
Immediate and cost
effective solution.
All of the pieces are
now in place from the private sector. The International Space Station can be
retasked to be the kernel of a modularly
expanding colony. Bigelow Aerospace has modules in production and is
testing a module currently attached to the ISS. This colony can be easily
supported from earth with private sector spacecraft currently in operation.
Revenues
This colony could generate revenues by functioning as a
tourist hotel and space port. Space shuttles can be assembled here for
exploring the solar system, asteroid mining, establishing farther out colonies,
etc. These shuttles can be as large as needed since they don't land on planets.
They can carry landers if required.
Zero-G
The biggest argument against such a colony is bone loss and
other health problems due to zero-G. I discount this argument because life
evolved in the oceans. Training in pools is the closest astronauts can get to zero-G on earth. Whales may
suffocate when beached, but in the ocean, their bones and organs are just fine.
We should be able to adapt as well as they did.
However, permanent space colonists must commit to never
living on a planet. They will never again have to plod around under the tyranny
of gravity. In zero-G people can essentially fly. Unneeded feet can evolve into
hands (What does God need with feet? Are we really made in His image?) Life
could actually be better.
Yes, they will forever
be dependent upon technology. But naturalists don't understand how dependant and vulnerable we are on this one of a kind jewel of a
planet. It can be gone in a heartbeat. We must expand our horizons as soon as
possible.
If it turns out zero-G is not feasible, we should be able to
figure it out long before these colonists are unable to re-adapt to a gravity
well.
Self Sufficiency
A priority will be to become self-reliant as soon as
possible. This will be the best insurance policy for the survival of the human
race. It will be absolutely necessary for remote colonies and can be developed at low risk here.
Shielding
The advantage of a low earth orbit colony is that it gets
sufficient shielding from earth's magnetosphere. However, the "day" is rather short
with a sunrise every 90 minutes . A geosynchronous orbit, or spacecraft will require artificial shielding. I propose a
magnet field generator at the center of the structure.
The Benefits of a
Magnetic Field
A strong magnetic
field will require quite a bit of power, but can have benefits in addition to
shielding. If it is AC or even pulsating DC,
it can be used to distribute power to devices throughout the
habitat without wiring. Pickup coils
will transform an AC magnetic field into local current.
One device can be a motility belt that will works against
the magnet field and propel the wearer throughput the structure, or enable station
keeping. It may be possible to design the belt to use the field like an
induction motor; requiring no local power source.
So the ideal habitat will have very large open spaces (simply bubbles) where the occupants can fly around in at will. This is infinity cheaper than O'Neill ships, that are massive and must withstand the enormous forces created by rotation in order to generate artificial gravity (no one living today will ever see one).
Generational Starships
So the ideal habitat will have very large open spaces (simply bubbles) where the occupants can fly around in at will. This is infinity cheaper than O'Neill ships, that are massive and must withstand the enormous forces created by rotation in order to generate artificial gravity (no one living today will ever see one).
Generational Starships
These habitats can be used as starships . All that is required is a propulsion source. I propose the sun. We use a Dyson swarm to collimate a large light beam to Alpha Centauri, using reflectors, or lasers if necessary. It should have a solar flux density roughly equal to that which illuminates Earth. This will provide all of the energy required for the journey. The habitats will use this "light bridge" to sail to the next star. It may take 100,000 years, but stay at homes will simply orbit the sun for that same time period. This light bridge should be miles in diameter in order to support a flotilla of spacecraft and all of the asteroids and comets that will be sent along for raw materials. Only light sails are required to these masses.
The one problem with this is that local inhabitants must maintain the bridge for the required length of time or. at least, not interfere with the robots built to maintain it. Assuming, of course that no other energy source is developed during that time.
Another argument is why try to colonize the next star with such low tech. In 1000 years we will develop warp drive and zoom past them. Maybe, but they can be picked up along the way. But then again what difference does it make whether you are spinning in circles around a star or on a linear trajectory between them. The habitat is your home.
This journey can be shortened significantly if the habitats can be decelerated in order to achieve orbit around the star. There is a danger of traveling so fast that the habitats cannot be captured by the star. If robots can be sent to the destination star ahead of time, they can build a bridge that can decelerate the habitats. This will be a more reliable energy source since it can't be interfered with by Terran politics. This opens the door for gravity lovers. A strong enough solar flux density can accelerate the habitats at one-G and then at mid point decelerate them at one-G. Sorry, but I can't do the math to come up with actual numbers for the journey to Alpha Centauri. However, since they will probably prefer to remain in their habitats while orbiting the star, they will be back to zero-G.
We colonized the Earth with sails. No one suggested to wait until we invent jets.
For those of you who can't conceive of a space habitat as comfortable as earth, you forget about the storms, hurricanes, tornadoes , fires, floods, earthquakes, etc. that we have had to deal with for the past 100,000 years.
Search for Intelligent Life
If some other intelligence in our galaxy is using light bridges for this purpose, we should be able to detect them. This will confirm both their presence and the viability of this approach. Start looking.
One reason we haven't seen aliens yet may be that intelligence life simply colonizes space. Living in zero-G may have advantages which includes lots of room for expansion. They may have little interest in gravity wells. All you need is a star for energy... if that.
So why aren't they orbiting our star and mining our asteroids? Perhaps there is no rush to spread your seed throughout the galaxy. Just doing it is sufficient.