The Fermi Paradox is not a paradox at all. We will see in this article why it is perfectly plausible that alien life exists elsewhere in the Universe and why aliens have never (and likely will never) come to our planet. In order to understand this, we must examine 2 ideas: the requisite conditions for life and the maximum efficacy of engines.
The Requisite Conditions for Life
All you need for life to be unavoidable is surface water and a satellite large enough to bind this water to the surface and sufficient proximity to the nearest star to liquefy the water. Together, these ingredients create a heat vortex on the surface of the planet which eventually gives rise to life, simply because any system tends to equilibrium and the equilibrial state is the one where the rate of change of the system is zero. That means the system will spontaneously reconfigure to be able to keep the system at a more stable temperature, which means that solar energy has nowhere to go but chemical bonds. Chemical bonds gradually become more complex until a self-replicating organism (such as RNA / DNA) self-assembles, at which point life is permanently seeded.
Read More Here:
Could Aliens Come Here?
Humans are the most intelligent species on Earth. In a Universe of 14 energetic dimensions, humans can construct ideas which are up to 11 dimensions in size. This suggests that as an organism, we are nearing the universal limit of intellectual capacity. Thus if aliens are smarter than us, they would have brains that could generate objects which were up to 14 dimensions in size: the universal limit.
Indeed, life, wherever it arises, will be limited by the Measurement Limit. Advanced consciousness happens only in more complex life, because the consciousness is a subset of the total electric field of the body, which itself is generated by the total caloric intake. Thus those beings capable of manifesting the consciousness required to create a spaceship capable of interstellar travel would have to have a high caloric requirement.
This presents a problem for continued survival aboard a spaceship because of the high mass of the food that would need to be brought along for the trip. Even Saturn, which is very close to us, relatively speaking (it is in our Solar System) is 1 400 000 000 kilometres away. The fastest land craft ever created was able to travel at 1227 km/h. At this speed, it would take 1140994 hours or 130 years to reach Saturn. The fastest rocket would get you there at 75639 km/h in about 2.11 years. Even this is hardly a small feat, because we would need to bring aboard enough food to feed the astronauts for all this time. If you just went there and came right back, it would still take over 4 years! How are you going to fit all that food / fuel onto the ship!?
We already know that there is no complex life elsewhere in the Solar System, and we also know that the next closest Solar System: Proxima Centauri is 4.22 light years away. The fastest human-made rocket would only get there in 60 253 years! We cannot even guarantee that the Earth biomass can create the amount of food required for such a journey.
In fact, we cannot even guarantee humans will persist on Earth another 60 000 years!
These facts may seem inconsequential to the reality of aliens, but we must recall that these hypothetical aliens are still bound by the same causality laws that we are. That means that they would have to travel all the way to our Solar System to be able to physically land on Earth. We can see based on the math above that this scenario is implausible.
But Muh Superior Alien Technology!
Aliens would still be subject to the laws of the Universe. They would not be able to build an engine which is more efficient than a Carnot engine, which can be proven to be the most efficient engine using Entropy alone. These aliens would face the same issues with keeping their biomass alive in space as we would. In fact, if they were indeed intellectually superior, their caloric demands would be even higher than ours!
The Hypothesis of Greatest Probability
In our religion, we examine all possibilities and then evaluate the explanation of highest probability. This is similar to the idea of Occam’s razor: if a simpler explanation exists, we favour it. If no evidence supports an hypothesis, we reject it. If those purveyors of an indirectly validated hypothesis are not credible, we also reject it.
The hypothesis of greatest likelihood is that there are indeed U.F.O.’s but that these are human technology or meteors. Any “abductions” are either attention-seeking fantasies or they are done by humans. Aliens are not physically present on Earth because of interstellar distances which are insurmountable to complex living organisms. Given the size of the Universe however, we can be pretty much guaranteed that life will arise somewhere. Namely: anywhere where a sufficient body of water is gravitationally bound to a planet by a satellite at a sufficient proximity to liquefy at least some of the water. Note that life arose at approximately the same time as the planet did (some 4 Billion years ago), and so it doesn’t take long for life to arise once the proper ingredients are there. How complex life is on any given planet depends on how much time (and therefore how much solar energy has been absorbed by the biome) has passed since the planet was created. Note that planets are created by Stars and Stars are created by Neutron Stars, as evidenced here.