Life forms different from us
Imagine that within the gas giant planets there are forms of life floating around. Deep inside it is warm enough. The pressures and gravitational fields are strong yet relatively uniform. The basic chemical building blocks are all there. There has been more than adequate time for these life forms to develop. Finally the volume of space for development is tremendous inside Jupiter and Saturn especially. I posit that there may indeed be other forms of intelligent life right here in our own solar system, inaccessible and isolated, whom do not even know of the existence of our universe, only the environment they are constrained to. They may be highly advanced in many ways and not even know there is more to their existence than their own environment. And hence it may be the same for us, everything we think we see may not really be all there really is. We are constrained by our senses. Read A Critique of Pure Reason by Kant.