Surviving As Civilisation – SAC
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a space colony of a planetary scale cannot be built full entirely, until the very center on the colony. even though the overall gravity of the colony won’t be as large as of a planet of the same size, or even of the same mass being in a larger volume, having hollow cells and plenty of flexibility space between the cells, it would still have a large enough pull toward the center. any loose pieces broken off the cellular structure, with space between the cells, would drift to the center of the colony and accumulate there. but the center of the colony cannot be left completely empty neither, because then the floating debris will accumulate in other areas with largest gravitational pull. in the center of the colony, as mentioned in previous writings on the topic, could be a symbolic artificial sun, which must have enough mass to attract floating debris, which will then be collected and recycled. the artificial sun is just a name, not working on the same principle as a star. it would rather consist of lightweight light sources, easy to swap out when needed.
by the way, between the cells of the space colony there could also be built nets, to catch larger objects broken off from the cells and hard to rebuild, but you cannot catch it all. the nets will be installed only in critical areas, not everywhere. those will rather be temporary nets during reparation works and in the areas under construction. putting the nets up everywhere between the cells would waste the resources without adding much effectiveness. they would need to be fabricated, transported, attached, maintained and cleaned. a falling debris will not pose a threat to the cells farther away from the point it got loose from, because the microgravity will increase only by a small amount towards the center, being surrounded by the large mass of the structure around. only a space debris far out of the entire colony will gather a significant speed to pose a danger to the cells it will have an impact with.
to have a large mass in the center, without uselessly wasting materials for creating the necessary mass, there could be a large storage area of raw materials, but it cannot be a storage location of all of the raw materials the colony has. most of the materials must be dispersed all around the colony in countless locations, to protect against losing it all due to an accident. when the colony is expanding, with new raw materials being excavated from space objects around, and the center of gravity will begin weakening relative to the expanded colony, some of the new material can be added to the center of the space colony, keeping the central attraction in place and the structural stresses of the space colony within limits.
if an impact with a large space rock will be inevitable, then it must be calculated how much mass the rock would add to the outer region of the entire structure, in case it has not enough energy to pass through the structure and leave with enough speed to not return. the extra mass must then be in advance added to the center, to keep the stability of the structure. if the center of the mass is not taken care of and it becomes unstable, then due to the changed structural stresses the entire space colony may collapse by disconnecting the weak connections between cells. the relatively weak connections throughout the entire colony, between tough cells, must be present, reasons for which have been explained in previous writings.
rotating the entire space colony, in an attempt of creating sufficient gravity for living organisms, will not be necessary. it won’t be possible anyway to keep the gravity equal for all locations in the colony, some of it being farther away and some closer to the rotational axis. the space colony will be spherical — there will not be possible to create equal gravity for all as on the surface of a planet. a small rotation will be a good idea though, for a better structural stability and to quickly eliminate wobble in case of an explosion in any part of the space colony. in the microgravity conditions, in the absence of rotation, with flexible joints between the countless stiff cells, a wave-like wobble after an explosion or a collision can last an inconveniently long time, going back and forth throughout the entire structure.
during the construction process, while using up the earth’s raw materials and by that process dispersing materials farther away from the center, the gravity will gradually diminish. the gradual diminishing of gravity in slow pace will leave enough time to select the most suitable living organisms for the microgravity conditions. for humans, if it will be impossible to adapt fast enough, or to modify the biology to be resistant enough, there will be constructed small local gravity wheels all throughout the colony, for regular exercises and recovery times. the gravity wheels will also be useful in preparation for landings on different planets, for mining purposes, to train the landing crew. the gravity wheels will be able to test the technology and to prepare biological organisms, be it people or others, for any landing conditions.
the entire process of construction of the colony will take thousands of years, most likely even tens and hundreds of thousands of years, but not millions of years i suppose, due to the accelerated exponential technological advancement. several thousands of years will be enough to select and prepare the best organisms suited for living in microgravity, during the time period when the process of using up the earth will gradually diminish its gravity. big part of the colony will find itself on farther away reaches from the center, far from significant gravitational pull, thus for any level of adaptation a necessary distance from the center can be selected.
the entire space colony must be constructed with a distant future in mind, capable of splitting into several smaller space colonies, when the gravity will be small enough not to be an issue in dividing the colony. as the colony will be constructed from replaceable cells, such a prospect is completely achievable. it only needs to be calculated how to divide the reserve raw materials, space factories, and everything else, so that every colony will be completely self sufficient. all that future division must be built into the project, so it won’t require an impossible effort by future generations.
keeping in mind the future relocation of the cells, and also the changing stresses to different parts during the construction and expansion of the colony, the joints between the cells must be highly universal, adaptable to different levels of loads, easy to change for different breaking point stresses, and to changing levels of vibration amortisation. the cells themselves must be built to withstand a maximum possible stress as nobody knows which failure or collapse can happen at any given time. the joints though, meant to protect from losing it all due to failures in some areas, must break before the cells break. each cell must have built in several additional connecting points of the joints for adding more of the joints when needed, and for the replacement procedures. it will be safer to install a new joint before removing an old one, thus the redundancy in connecting points is a must, even though it means extra expense on building the cells of the colony.
clearly, even a thousand years is a too long time for the civilisation to be prepared for a survival in space, without the earth. who knows when a disaster of a global scale will hit. thus, the construction of the space colony must also be prepared for all kind of realistic scenarios while still attached to earth — i already mentioned this in my previous writings on the subject, the sky gardens. but after the sky gardens are ready it must be taken quickly to a whole new level.
you cannot prepare against all the wandering black holes though, and even a self sufficient space colony cannot do that. the only way to survive a black hole as a civilisation is to split the colony into several smaller colonies, keeping them at a safe distance. while a big wandering black hole could be detected with its effects on surrounding stars and planets, changing their natural observed trajectory, a tiny black hole can be left undetected. to destroy life completely on earth it will be enough if a black hole with a diameter of 1mm (one millimeter) will fly by, with no direct hit needed. but a chance of it happening is pretty unlikely. more likely is for a large enough volcano to wake up, capable of another global scale extinction, if the civilisation is not prepared. the spaceships in construction, still attached to the earth, must be built to save as much life as possible in the nearest future. that should be the primary goal. later the colony can be expanded for a comfortable and completely self sufficient existence, with no need to continue using the earth for raw materials.
when the space colony will be capable of leaving the earth’s gravity then at least one part of the colony should do it, locating itself at a safe distance from earth. the rest of the colony must keep using the earth, to save up raw materials of the entire earth in the form of half ready materials of production, just in case they will be needed. it would be a waste to leave earth with entire colony as soon as the space colony can do it, leaving everything behind. who knows when there will be such an opportunity for the colony to mine everything it needs in such an abundance. but the prospect of leaving the earth behind quickly must be envisioned, in case it becomes necessary for the survival of the civilisation. a few thousand years to get ready.. it’s already a gamble, but that’s the fastest possible time i think. it can be faster though, if some “miracles” in science be achieved, like protection from gravity, or other significant tools to rapidly increase the chances of survival.
the real progress is already being made with tapping into zero point energy, but currently it’s only a proof of concept, it needs to be scaled up for a use even in tiny electronics. at this moment, to my knowledge, it’s very far from powering spaceships to overcome gravity or inertia. but once it becomes possible, the zero point energy will provide with literally limitless energy, which will definitely solve all problems, including creation of a powerful magnetic field around the colony, to protect from cosmic radiation, and powerful lasers against cosmic rocks that would pose a threat to the structure, and many other obstacles for real space travel, far from the earth’s low orbit. everything is behind the energy available.. energy is everything, literally.
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by now for sure you already have a bigger picture of the needed work to be done for the survival. think again is it worth to spend your time on fixing some design elements in your current place of living, or to waste your time on even less important things. i don’t mean that one shouldn’t enjoy pleasures of life at all and only work for survival — what’s the point in surviving if there’s no pleasure in life. what i mean is that it’s time, and still not too late, to think again if the balance is right between the pleasures of life and work to be done for the survival of the entire civilisation. if nobody survives then also your very own life has been wasted, with whatever you planned to leave behind for the future generations.
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