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So we need at least 3.2e+16 J for propulsion and 1.408e+18 J for evaporation(assume 22MJ/kg, not necessary true, but somewhat realistic). …

Impossibur Actually 2-D representation is not that bad, because the problem is axially symmetric, and actually 1-D at great distances as being both in their own star systems there are not that many me …

Improvement №1 Shall we begin with a bit different thing, the material One of the strongest lightweight materials known It is more an advert what they do, and what can be potentially made. Question-re …

With ant's there are at least 2 major obstacles, preventing them to be sapient. Speed of information transfer and mobility. Also maybe more fundamental, system as whole(or some aspects of it) whic …

If they have superior cognitive functiins, they do not need ones approval, and by nature of human psyhology they will have it. It like a situation with dogs - we are smart big dogs, and they accept it …

Assuming gradual decrease of production capacity, proportional to land mass dissapearance, which not so realistic, but if then numbers needs to be slashed in half. …

I have seen people who spend way too much effort on realistic combat strategies which are easily countered by some different and quite obvious strategies. …

No. At least like in current days approach and economies. We can see that industry and what makes the industry possible aka technologies, research and development is what brings money, if we strike ou …

Sure it will and it does protect them, assuming wind patterns are more or less consistent as you said it is, which is realistic enough, not like you say "unrealistic", wind patterns are a thing. …

Time (subjective in your case) mentiont in Otkin's answer is realistic, so as suggestion to not rely on strong will that much. … for now there is no way to tell, in the future it can be a different story, and some selection process can be quite realistic, for your situation, so as some adjusting training and other things. …

They definitely will need better shoes. One 10t strength, with mass 100kg - will jump probably 100m high (or less because of air) with initial velocity ca 44 m/s, duration of jump 0.045sec, 4.5 sec f …

Also this question Stealth in Space: How realistic is it? have some good points, besides accepted answer. There is a battle between the tech and ability to trick that tech and people behind it. … How can it be in more realistic way First of all prepare for future war, make more flying engines aka drones Thermonuclear engines have great potential in solar system travel. …

However, maintenance task might be not that hard as it looks now it has to be, and it can be done with realistic(my opinion) means of ... hm it seems I can't avoid the word ... smart matter. … I assume the option as realistic because I keep in mind particular implementation of such technology which is not that much sophisticated, definitely not a clarke-tech, and pretty much fits in +200 years …

As acceleration rate - it realistic, but if as an example you need to adjust it for some reason having 1-2 gens arriving at a particular age, then you can do that safely, as it is on the conservative side …

If you looking for a realistic premise, then you should first define what is used to accelerate the craft to the speeds. …