Matter — Dark

It provides the "glue" that keeps galaxies from flying apart.

Dark matter makes up roughly , dwarfing the "ordinary" matter—stars, planets, and people—which accounts for less than 5%.

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 Dark Matter

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

The exact identity of dark matter remains unknown, though several leading theories exist: The quest for dark matter with Matt Bothwell 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

Most evidence suggests dark matter is "cold," meaning its particles move slowly relative to the speed of light. 🔭 Key Evidence According to Newtonian physics, they should have been

Dark matter is one of the most significant mysteries in modern science, representing a substance that does not emit, absorb, or reflect light, yet exerts a powerful gravitational pull on the universe. While it remains invisible to traditional telescopes, its presence is inferred by its impact on the visible world. The Cosmic Invisible