In 1952, Earth may have been visited by interstellar spacecraft using a highly advanced antimatter propulsion system that can reach speeds as fast as 98% of the speed of light!
Why do some believe this, and how could Extraterrestrials travel at this kind of mind boggling speed?
#space #alien #uap

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https://www.academia.edu/59365024/The...
https://arxiv.org/pdf/2310.09035.pdf