Electromagnetic radiation, including light, is generally understood to require a source, such as charges or energy changes, to exist. While theoretical concepts like vacuum solutions suggest that electromagnetic fields can exist without sources, these have not been observed in practice. The Cosmic Microwave Background Radiation and phenomena like Hawking radiation are often cited, but they still trace back to initial sources, such as the Big Bang. Discussions also highlight that while vacuum fluctuations might imply the creation of particles, these are not considered "real" in the traditional sense. Ultimately, all known electromagnetic activities are linked to sources, though some theoretical scenarios allow for the possibility of sourceless existence.
