Planck refers to Max Planck, a German physicist who is considered the father of quantum theory. His work fundamentally changed our understanding of atomic and subatomic processes, and his introduction of the concept of quantized energy levels laid the groundwork for modern physics. This idea is crucial when examining the cosmic microwave background (CMB) radiation, which provides insights into the early universe, as well as the standard ΛCDM model that describes the composition and evolution of the cosmos.
congrats on reading the definition of Planck. now let's actually learn it.