&gt;Second, that the Fermi Paradox exists at least partly due to aliens avoiding us specifically, what is commonly referred to as the &quot;zoo hypothesis&quot;. As far as speculative explanations go, it&#x27;s not an unreasonable contender. However, it is not among the most likely or the most simple hypotheses out there.<p>even we, Earthicans, can learn from Columbus visiting America and the following fate of civilizations there. Any higher developed civilization definitely has &quot;zoo&quot;&#x2F;Prime Directive principle in place.<p>A technological civilization stage between start of building machines (Industrial Revolution in our case) and FTL (and thus also leaving EM related tech behind) is pretty short, thousands, may be tens of thousands of years - absolutely not enough to have overlaps  between tech civilizations to listen&#x2F;watch radio&#x2F;TV of each other.<p>&gt;The zoo hypothesis pre-supposes the ready availability of FTL technology, which itself implies that such technology is even possible in general.<p>well, far galaxies run away from us at speeds higher than FTL, so it is possible. Space expansion is different machinery and not subject to &quot;c&quot; limit (that limit is only valid against static space)