Brigham Young, August 24, 1872: Journal of Discourses
“How much matter do you suppose there is between here and some of the fixed stars which we can see? Enough to frame many, very many millions of such earths as this, yet it is now so diffused, clear and pure, that we look through it and behold the stars. Yet the matter is there. Can you form any conception of this? Can you form any idea of the minuteness of matter?”
“Dark Matter“, Wikipedia
“The first to provide evidence and infer the existence of a phenomenon that has come to be called “dark matter” was Swiss astrophysicist Fritz Zwicky, of the California Institute of Technology in 1933. He . . . obtained evidence of unseen mass. . . . Assuming that the visible material makes up only a small part of the (galaxy) cluster is the most straightforward way of accounting for this (his findings). Galaxies show signs of being composed largely of a roughly spherically symmetric, centrally concentrated halo of dark matter with the visible matter concentrated in a disc at the center.
“… the Milky Way is believed to have roughly 10 times as much dark matter as ordinary matter.
“. . . In 2005, astronomers from Cardiff University claimed to discover a galaxy made almost entirely of dark matter, 50 million light years away in the Virgo Cluster, which . . . does not appear to contain any visible stars.”
Pie chart showing that the bulk (96%) of the mass (matter and energy) in the universe is invisible.