Another mystery is that though neutrons are different from anti neutrons, they are both neutrally charged. Both of them are made of quarks that possess fractional electrical charges, and the charges of these quarks are equal and opposite to one another in neutrons and antineutrons.
The known universe is composed of everyday matter. Another more profound mystery is, why the universe is not made up of equal parts antimatter, since the Big Bang that is thought to have created the universe 13.7 billion years ago produced equal amounts of both. And if matter and antimatter appear to be mirror images of each other in every respect save their electrical charge, there might not be much any of either type of matter left — matter and antimatter annihilate when they encounter each other. [The 9 Biggest Unsolved Mysteries in Physics]
A newly reported experiment involving matter and antimatter was carried out in CERN's Antiproton Decelerator. | CREDIT: N. Kuroda |
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