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In the vast expanse of the universe, I believe it unlikely the Earth the only planet able to sustain what we know as life. Are there civilizations out there with a greater knowledge of physics and able to travel immense distances? Maybe, maybe not. I need to see real proof. I need to see...

The vastness of the universe. Hard to believe this planet is the only one with life forms.

I believe there must be other planets with life, even if it does not conform to our definition of life. Whether or not Earth has been visited by alien life is another matter. Such travel would be beyond our understanding of physics. All the theories of manipulating time and space are fun...