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I think there could be other worlds out there like ours. Will we ever communicate with them? Probably not.

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Everything that is outside our galaxy is another universe for all intents and purposes.Pollution and wars are the reason that the Earth has been quarantined from the rest of the higher life forms in the galaxy. They can see us but we can see them. The van Allen belt prevents any Earth being from going into heaven which at the galactic center where the ancient ones live and rule many inhabited planetary systems. We look psychotic to them.

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Since the number of stars out there are astronomical (he he) the chances of another earth like planet with lifeforms like is good.
hmm, maybe my other self is named Yttap Ybbark

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I also think there could be thousands of other Earths full of humans. We are just specks of dust when you think about the entire Universe

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I think it is so possible. When you realize that the Universe is endless and that there are more solar systems out there.