Most evidence suggests dark matter is "cold," meaning its particles move slowly relative to the speed of light. рџ” Key Evidence
It does not interact with electromagnetic forces, meaning it is completely transparent. Dark Matter
It provides the "glue" that keeps galaxies from flying apart. Most evidence suggests dark matter is "cold," meaning
The exact identity of dark matter remains unknown, though several leading theories exist: The quest for dark matter with Matt Bothwell The exact identity of dark matter remains unknown,
Dark matter makes up roughly , dwarfing the "ordinary" matter—stars, planets, and people—which accounts for less than 5%.
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
As early as the 1930s, Swiss astronomer Fritz Zwicky noticed that galaxies in the Coma Cluster were moving far too fast to be held together by visible matter alone. He coined the term "dunkle Materie" (dark matter) to describe the missing mass. Gravitational Lensing