First light refers to the period in the history of the universe when the first stars and galaxies began to form and emit light. This era, which occurred approximately 13.7 billion years ago, marks a crucial milestone in the evolution of the cosmos. Studying first light allows researchers to understand the early universe, the formation of structures within it, and the processes that led to the universe we observe today. Researchers use a variety of observational techniques, such as telescopes and satellites, to study first light and gain insights into the origins of the universe.