So on the topic of space expansionism, I think there would be books to fill with considerations about it, but some of them I'd like to point out here, starting with the utmost important one first:<br><br>1. Special Cosmos Ethics Theorem (Tomasik-Huber): Exoplanet-Wildlife-Development-Control-dependent Anti-Panspermia Directive for Humanity<br>The current state of the art of scientific evidence and ethics without exception imperatively demands that humanity does NOT engage in outer space activities of kinds that could even just infinitesimally likely risk introducing life to for any kind of lifeforms habitable worlds, for at least as long as humanity's practical capability of controlling the up to astronomically vast consequences of interstellar space projects doesn't sufficiently improve in a for interstellar space endeavors safety guaranteeing, critical manner.<br><br>Proof (by contradiction):<br>This conclusion deductively follows from the concerningly plausible, by many scientific studies supported, Axiom that general animal wildlife - not only as it has been throughout evolution on earth, but on a more general level that would apply to exoplanet life of our biological kind, too - for the vast majority of it is dominated by pain and suffering rather than joy (reference: Center for Long-Term Risk).<br><br>Assume the existence of a counter-example:<br>It could be argued that IF overall worthwhile to exist life on a larger scale were to rely on previous evolutionary animal wildlife's existence and that the former were to safely come from the latter, that THEN it could possibly be better for evolutionary animal wildlife to come into existence than not.<br><br>Proof (by Ethical Dominance Principle) of the impossibility of the existence of counter-examples:<br>However, given that aforementioned, dominant wildlife animal pain and suffering in its amount and hence importance and priority for macro-scale decision-making increases by the duration throughout which such a miserable, in itself unwantable state persists, and that in the case of general forms of evolution of life, we have to expect that it can last for extraordinary long times of what essentially is involuntary, if avoidable unnecessary torture by the banal means of nature's own ruthlessness, namely that it can last for billions of years, and furthermore that these time-spans are unavoidable if it shall lead to intelligent species, we can therefore conclude that the severity of this issue dominates every other to this date conceivable, plausible ethical issue, since all other ethical issues absolutely pale in comparison to the magnitudes of magnitudes by which this central ethical issue overshadows them all, in such a uniquely outstanding way that risking billion years full of suffering for thousands of individuals of at any time billions of wildlife exoplanet animals each can for nothing in the world be a by any standards reasonable sacrifice to make.<br><br>Therefore, by humanity's current full body of knowledge, what happens to wildlife animals part of any actual, prospective, or potentially risked to exist instances of evolution of life constitutes the single most dominating, for ethical macro-scale decision-making behavior sole determinant factor of consideration.<br><br>Corollary 1.1: Time-Global Anti-Panspermia Directive for Humanity<br>If humanity is never able or can never be able to safely control exoplanet wildlife's entire development for the purpose of guaranteeing its &amp; all by its own activities potentially emerging foreign exoplanet wildlife's pain-less flourishing, for any exoplanet wildlife risked to emerge or exist as consequence of humanity's outer space activities, then it follows that humanity shall NEVER engage in activities that risk causing such.<br><br>2. Central Cosmos Ethics Theorem (Huber): General Anti-Panspermia Prime Directive<br>If the result of wildlife well-being evaluations of enough and sufficiently in time extended initial or lasting portions of expected or prospective cases of evolution of life is generally among all other ethically relevant factors the dominant ethical concern, and if furthermore a large enough unavoidable negative expected wildlife well-being has to be assumed of sufficiently common forms of expected or prospective cases of evolution of life, then imperative necessity of complete prevention of all preventable forms of panspermia follows.<br><br>The proof of this theorem is left as a mental exercise for the reader, as stimulation to personally engage with the subject matter : -)<br><br>Corollary 2.1: Anti-Panspermia Directive on local Star System Contamination<br>Any at least infinitesimally panspermia risking contamination of a celestial body within the local star system with (not necessarily extremophile) micro-organisms is to be prevented. This includes causing the emergence and spread of micro-organisms on a celestial body of the local star system, potentially followed by eventual interstellar transportation of by it emerging (extremophile) micro-organisms on the celestial body via natural panspermia, such as meteorites entering such celestial body's atmosphere to pick the organisms up and continue towards interstellar space via sling-shot.<br><br>Corollary 2.2: Anti-Panspermia Directive on Space-Faring<br>Any at least infinitesimally panspermia risking space-faring activities are to be prevented. This includes von-Neumann-Probes (self-replicating Spacecraft), (replicating) seeder ships, and space-faring of individuals where the Anti-Panspermia abiding behavior of them and later generations after them cannot be ensured.<br><br>Corollary 2.3: Natural Anti-Panspermia Directive<br>Any at least infinitesimally panspermia risking, preventable natural litho-panspermia processes are to be prevented. This includes (extremophile) micro-organism transportation methods via space dust, meteorites, asteroids, comets, planetoids, planets, and debris ejected into space upon celestial body collisions.<br><br>Corollary 2.4: Anti-Panspermia Directive on Mega-Structures<br>Any construction of a mega-structure that at least infinitesimally - due to literally far reaching psychological influences - risks panspermia being risked or pursued via outer space activities from any other - for the detection of such mega-structure in astronomy engaging - alien civilization is to be prevented.