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Q&A How to tell if the entire Earth is just a copy?

Imagine a visiting alien accidentally spilled a bucket of inverse matter (a substance I made up just now) on the planet Earth and this stuff will annihilate with ordinary matter to produce neutrino...

4 answers  ·  posted 5y ago by user6760‭  ·  last activity 5y ago by user6760‭

Question technology aliens earth