It provides the "glue" that keeps galaxies from flying apart.
Scientists discovered dark matter not by seeing it, but by noticing that the universe's "math" didn't add up without it. Galaxy Rotation Curves Dark Matter
It does not interact with electromagnetic forces, meaning it is completely transparent. It provides the "glue" that keeps galaxies from flying apart
In the 1970s, astronomer Vera Rubin observed that stars at the edges of spiral galaxies were moving just as fast as those near the center. According to Newtonian physics, they should have been moving much slower or flying off into space unless some unseen mass was holding them in place. Galaxy Clusters In the 1970s, astronomer Vera Rubin observed that
The exact identity of dark matter remains unknown, though several leading theories exist: The quest for dark matter with Matt Bothwell
Dark matter makes up roughly , dwarfing the "ordinary" matter—stars, planets, and people—which accounts for less than 5%.
