Theoretically, it’s impossible for us to perceive a 4D creature. That is, unless it broke into our three-dimensional reality.
Be it sci-fi, immigration or even artificial intelligence, the concept of "aliens" mirrors how we define fear, fascination and the "others" among us.What springs to mind at the mention of "alien"?
Stellar plasma can smear alien radio signals before they escape their star system, making them harder for astronomers to detect.
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