Matter: Dark

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

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

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

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 makes up roughly , dwarfing the