Contact: Robert Sanders
University of California - Berkeley
Caption: UC Berkeley/LBNL physicists asked the question, does normal hydrogen (left, with a negatively charged electron orbiting a positively charged proton) weigh the same as antihydrogen (a positively charged positron orbiting a negatively charged antiproton)?
Credit: Image by Chukman So, UC Berkeley.
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Related news release: Is antimatter anti-gravity?