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For instance, if we one day find evidence that extraterrestrials have created life on earth, science had to deal with those extraterrestrials. Especially with the question how they evolved and became able to create life.

An interesting fact here in context is that one of the Nobel prize scientists, and discoverer of the precise shape of DNA, Francis Crick, believed that life originated from another planet. And why? Because of his intimate knowledge about the makeup and structure of DNA, he knew that the complexity couldnt have come about by chance.

By jcl's oversimplified view of abiogenesis, life is not a hard probability at all, so it should be popping up all over the planet.

http://en.wikipedia.org/wiki/Francis_Crick