CERN. Torbjorn Toby Jorgensen/Wikimedia Commons Scientists at CERN, the European Organization for Nuclear Research, used lasers to freeze positronium, an exotic atom made of both matter and antimatter. Antimatter is a mirror of normal matter: “Antihydrogen,” for instance, has a positive “positron” orbiting a negative antiproton, where hydrogen has a negative electron orbiting a positive proton. Positronium, meanwhile, is a positron and an electron orbiting each other. If matter and antimatter touch they annihilate, releasing huge amounts of energy, meaning positronium usually only exists for 142 billionths of a second. But by freezing it to -148 degrees Fahrenheit, scientists slowed the atoms down for study. Scientists at CERN hope further breakthroughs will teach them about the early universe, as well as having practical implications for medical imaging, cancer treatment, and even interstellar travel. |