FUSION IS THE POWER SOURCE OF THE SUN AND STARS. IT OCCURS WHEN FORMS OF THE LIGHTEST ATOM, HYDROGEN, COMBINE TO MAKE HELIUM IN A VERY HOT (100 MILLION DEGREE CENTIGRADE) IONIZED GAS, OR PLASMA. Source - U.S. Department of Energy, Public Domain Researchers have long searched for alternatives to iridium, an extremely rare, incredibly expensive metal used in the production of clean hydrogen...