The composition of the universe—the elements that are the building blocks for every bit of matter—is ever-changing and ever-evolving, thanks to the lives and deaths of stars. googletag.cmd.push(function() { googletag.display(‘div-gpt-ad-1449240174198-2′); }); An outline of how those elements form as stars grow and explode and fade and merge is detailed in a review article published Jan. 31 is the journal Science. “The universe went through some very interesting changes, where all of a sudden the periodic table—the total number of elements in the universe—changed a lot,” said Jennifer Johnson, a professor of astronomy at The Ohio State University and the article’s author. “For 100 million years after the Big Bang, there was nothing but hydrogen, helium and lithium. And then we started to get carbon and oxygen and really important things. And now, we’re kind of in the glory days of populating the periodic table.” The periodic table has helped humans understand the elements of the universe since the 1860s, when a Russian chemist, Dmitri Mendeleev, recognized that certain elements behaved the same way chemically, and organized them in...