So many solar systems out there, life evolved in many planets for sure. No proof but no doubt.
Life? Probably. Something that has thinking capabilities? Much more doubtful.
One proof is that we are thinking, and so are dogs, cats and monkeys to a lesser extent.
That’s hardly proof considering these examples all share a common ancestor. I ask you, can you communicate with a slime mold? Even the slime mold is more similar to ourselves than any potential life we’d find elsewhere, as we share a common ancestor.
What's so important about "sharing a common ancestor"? It doesn't say anything about the spread of different types of life that could evolve, considering we have a sample size of one, and it also says nothing about how difficult it is for any particular form to evolve intelligence.
Knowing physics is roughly same every where in the universe, same rules of biology will apply elsewhere where if conditions meet, maybe earth is one of many conditions that can form life.