Watch the full episode here: https://youtu.be/HeR2Ghwzn8k
Billions of years ago, another planet smashed into Earth. An event of this epicness could have created our Moon. It also could have brought alien life to our planet. What evidence of this planet still exists on Earth today? Could there be life deep inside the Earth’s surface? And could that life be an advanced civilization of humanoid aliens? Would it be possible for subterranean cities to exist within Earth?
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