alt Hacker NewsThis is yet another case where a layman-written wiki article about physics is highly confusing to other laypeople, because it only tells you half the story. Particularly because it seems to be based on a chapter of Feynman's popular science book. But the book actually goes on and points out how Feynman immediately dismissed Wheeler's hypothesis, because the universe contains a lot more electrons than positrons. You'd have to explain that imbalance first if you want to entertain this line of thought.
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Yea, it's really more about the fact that all electrons are exactly the same regardless of the level of precision we look at them. It would be like if we found another earth and that earth was the exact same earth. Not earth like, not very close to earth. The exact same earth down to the smallest fundamental level.
As a layperson myself - how can we tell that a distant celestial object is not made from antimatter? Afaik, it doesn't behave differently from matter, other than it annihilates on contact.
Also even if we could, that would only describe the practically and theoretically observable universe, which doesn't rule out other places looking very different (on its own)