Hydrogen's antimatter counterpart has shown its true colors, and they are just what physicists ordered. Antihydrogen atoms are made of a positron (a positively charged version of the electron) orbiting a negatively charged antiproton. According to the standard model of particle physics, these anti-atoms should absorb and emit light at the same wavelengths as hydrogen. Now antihydrogen's spectrum has been measured at last, and it confirms the prediction. Antimatter is notoriously difficult to work with, because the moment it touches normal matter both
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