Star fusion does it every day.

Evidence that something exists is evidence that it is created.

Alchemy and AI are both a bit more culturally specific. I agree that seeing life on earth would not logically be inconsistent with extr-terrestial life existing. But that is not to say AI=ET.

But it does: http://en.wikipedia.org/wiki/Nuclear_transmutation

if by alchemy you mean making gold from another element then it does exist. we just cant do it yet

We can. It involves particle accelerators and is mindbogglingly expensive.