Since the universe is unknowable to the individual, believing is an integral part of consciousness. This applies to scientific consciousness in full.
But scientific belief should not contradict physics.
Belief in aliens is no different from religion: it is just as unscientific, because it contradicts the special theory of relativity.
No movement in the space of the universe can occur faster than the speed of light. This means that neither interstellar travel nor inter-civilization contacts are possible.
Do not hope that there will be discoveries in physics in the future that will break the ban imposed by special relativity. There are no wormholes. Warp drive is not possible. Quantum teleportation is limited to the speed of light.
Any movement in the space of the universe with a speed exceeding the speed of light, that is, overtaking the maximum speed of information propagation, would violate causality.
Violations of causality are impossible: everything that happens is always grounded by its prehistory.
A warp flying saucer would break causation. Like any religious, mystical and mythical miracle. This is why belief in aliens is no different from religion. Strictly physical, the arrival of aliens would be as miraculous as the descent of a god.
If you observe something that is not yet amenable to explanation, look for local, physically grounded reasons for this phenomenon that do not violate causality.
Or, if you like, believe in miracles. But, if possible, try not to call your religion a science.
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