What can starlight tell us?

Starlight provides crucial information about the composition, temperature, distance, and motion of stars and galaxies. By analyzing the spectrum of starlight, astronomers can identify the chemical elements present, determine their temperatures, and measure their velocities through redshift or blueshift. Additionally, starlight helps in understanding the universe's expansion and the formation of celestial bodies over time. Overall, it serves as a fundamental tool for exploring the cosmos and unraveling its mysteries.