The irradiation and propagation of light in the universe is a ubiquitous phenomenon, which requires us to understand the existence form of light in the universe.
The irradiation and propagation of light in the universe is a ubiquitous phenomenon, which requires us to understand the existence form of light in the universe.
The irradiation and propagation of light in the universe is a ubiquitous phenomenon, which requires us to understand the existence form of light in the universe.