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One with a core made of pliable hyperon matter could have a smaller radius still.

And Gell-Mann made a prediction: that there should be one additional type of hyperon, that he called the W–, with strangeness –3, and certain mass and decay characteristics.

But whereas neutrons contain the most basic and lowest-energy quarks, known as up and down quarks, a hyperon has at least one of those replaced with an exotic ‘strange’ quark.