Weighing Antimatter (image) DOE/Lawrence Berkeley National Laboratory Caption Do atoms of antihydrogen weigh the same as atoms of ordinary hydrogen? Could they even have "negative" weight, pushing them away from ordinary mass? Scientists from Berkeley Lab and UC Berkeley have used data from the ALPHA Experiment at CERN to measure antimatter gravity directly. Credit Illustration by Chukman So Usage Restrictions with credit as given Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.