What Is Dark Matter

Dark matter is a hypothetical and invisible form of matter that does not interact with light or other electromagnetic radiation. The distribution of galaxy clusters and the large-scale structure of the universe are evidence for the existence of dark matter. The cosmic web of galaxy filaments and voids stretches over billions of light-years. Dark matter is thought to interact with normal matter only through gravity, making it invisible to our telescopes. The standard Lambda-CDM model of cosmology describes the universe's mass-energy content.