Wow, no one quoted the key rule of science: "absence of evidence is not evidence of absence."
Science is about what can be proven. No one can prove this yet. It is only a hypothesis. Until some proof is shown it can only ever be that.
That statement is so misused today its not even funny. Scientists claiming facts without evidence all over the place today. Just making huge statements without anything to back it up and see if it sticks. That is not science.