Archive: https://archive.today/JshYd From the post: >>Astronomers have discovered a vast tendril of hot gas linking four galaxy clusters and stretching out for 23 million light-years, 230 times the length of our galaxy. With 10 times the mass of the Milky Way, this filamentary structure accounts for much of the universe's "missing matter," the search for which has baffled scientists for decades. This "missing matter" doesn't refer to dark matter, the mysterious stuff that remains effectively invisible because it doesn't interact with light (sadly, that remains an ongoing puzzle). Instead, it is "ordinary matter" made up of atoms, composed of electrons, protons, and neutrons (collectively called baryons) which make up stars, planets, moons, and our bodies.