
Ask Ethan: What are the “first stars” in the universe? | By Ethan Siegel | Start with an explosion! | Jun, 2025
An illustration of the first stars that come on in the universe. Without metals to cool the gas groups that lead to the formation of the first stars, only the largest groups within a large cloud of mass will end up becoming stars: less in number but higher in mass, and very short than today’s…