The study explores the Cosmic Dawn, a pivotal phase in the universe's history when the first stars and galaxies emerged, transitioning it from darkness to light. It addresses the challenge of directly observing these earliest stars by utilizing a specific radio signal known as the 21-centimeter signal, generated by hydrogen atoms between star-forming regions just after the Big Bang. Led by the University of Cambridge, the team of astronomers delves into how the 21-centimeter signal can unveil the masses of the first stars and provide insights into the universe's evolution. Through the REACH project and the upcoming Square Kilometer Array (SKA), they aim to analyze fluctuations in cosmic signals to understand the cosmic dawn and the Epoch of Reionization. The research, detailed in Nature Astronomy, emphasizes the significance of radio telescopes in studying the early universe, particularly in probing the properties of the initial stars. By developing a model that considers the impact of various factors, such as ultraviolet starlight and X-ray emissions from dying stars, the team demonstrates the sensitivity of the 21-centimeter signal to the masses of the first stars. The study highlights the potential of radio telescopes like REACH and SKA in unraveling the mysteries of the early universe and sheds light on the nature of the very first stars. While optical telescopes provide visual data, radio astronomy offers a unique perspective through statistical analysis, enabling researchers to explore the characteristics of entire populations of stars, X-ray binary systems, and galaxies in the universe's infancy. The predictions made in the study pave the way for enhancing radio observations and understanding the early stages of cosmic evolution.