Well obviously, but how many times do scientists turn around and say yes the UFO in question is of alien/ET origin? My main hypothesis is that UFO's are made up of aircraft (known and not), Natural phenomenon, animal (birds), balloons (weather ones

) and those of ET theres a famous caption of the Concorde doing 1100mph released and it was only when viewers phoned in asking what the orb next to it was they had no idea... unexplainable obviously not a bird (swift flies the fastest), not a balloon, not big enough to be an aircraft, natural phenomenon is
very unlikely... if i'm wrong and its been admitted as a hoax fair enough, but hasnt yet to my knowledge...
i can automatically infer that there must be life on other worlds, its an impossibility for there
not to be life elsewhere even rare earth hypothesis states life is there but not in abundance, then you have panspermia which is the opposite which is that almost anywhere that has certain gases etc there will be life.