The heaviest element that humans have ever found is called oganesson. Each atom of the stuff packs a whopping 118 protons into its dense center. In contrast, hydrogen—the most abundant element in the universe, something you can find in your body, Earth's oceans and even the atmosphere of Jupiter—has only one. Scientists announced the discovery of oganesson in 2006, when a Russian-American team used a particle accelerator in Dubna, Russia, to fire millions of trillions of calcium ions at a target of heavy atoms. After 1,080 hours of collisions, the investigators had created three atoms of this new superheavy substance.