Scientists Detect Possible Missing 'Piece' Of Universe Created By The Big Bang Aside from dark matter and the dark energy that comprised the universe, there remained to be 5 percent of what was called the 'ordinary matter.' About two-thirds of this ordinary matter was left unaccounted for until now. by Athena Yenko
Science Cosmic Microwave Background From Big Bang Helps Resolve Missing Baryon Problem by Allan Adamson