In a first, scientists dropped antihydrogen atoms and measured how they fell.
In a first-of-its-kind experiment, scientists dropped antihydrogen atoms and watched them fall, showing that gravity attracts antimatter toward Earth, rather than repelling it.
Antimatter is the mirror image of matter, carrying the opposite electric charge but the same mass. An electron’s antiparticle, for example, is a positively charged particle called a positron. A proton’s alter ego is a negatively charged antiproton, and so on. In the experiment, performed at the European laboratory CERN near Geneva, scientists trapped antihydrogen atoms with strong magnetic fields. Those antihydrogen atoms were made by mixing antiprotons, created at CERN, with positrons from a radioactive source.
Researchers contained antihydrogen atoms within the ALPHA-g apparatus using magnetic fields. The team measured how the atoms fell when they were released. As the antimatter escaped, it hit the walls of the apparatus and annihilated. The researchers counted how many atoms went up and down by detecting those annihilations, as depicted in this animation. Most atoms went down, confirming that gravity pulls antimatter toward Earth, rather than repelling it.
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