@xris,
I don't have to answer your questions. Nothing obliges me to adhere to your terms, which in this case are an attempt to avoid the consequences of you having said that "science" seriously considers the existence of parallel universes. Providing sources that one or even a few scientists speculate to that effect don't meet the bill.
As for "playing" with myself, you really must be a legend in your own mind if you think you're the only person here with whom i have to speak.
Your silly speculation about parallel universes doesn't address the question of why an alien intelligence would come here. That question is really how would an alien species know we're here, and silly speculation about parallel universes doesn't answer that, either.
Speculation is meaningless. Unless you can prove something about that, we're stuck with the boring old alternatives of what we know.