Astronomers Have Found the Universe's Missing Matter
Astronomers have finally found the last of the missing universe. It\u2019s been hiding since the mid-1990s, when researchers decided to inventory all the \u201cordinary\u201d matter in the cosmos\u2014stars and planets and gas, anything made out of atomic parts. (This isn\u2019t \u201cdark matter,\u201d which remains a wholly separate enigma.) They had a pretty good idea of how much should be out there, based on theoretical studies of how matter was created during the Big Bang.