The 4 Percent Universe

"The 4 Percent Universe" is a term often associated with the exploration of dark matter and dark energy in the field of cosmology. It refers to the idea that only about 4 percent of the universe is composed of ordinary matter—such as stars, planets, and galaxies—made up of atoms. The remaining 96 percent is composed of dark matter (about 27 percent) and dark energy (about 69 percent).