Astronomers investigating why star formation peaked in “cosmic noon,” roughly 2–3 billion years after the Big Bang, report that internal structures in galaxies can efficiently funnel the needed gas. Multiple sources describe a period when star formation rates were up to about 100 times higher than in the present day. The key challenge is explaining how galaxies moved enough gas into regions where stars could form at such a high rate.
The research presented in these reports argues that galaxies earlier in cosmic history may not have been as chaotic as once thought. Instead of only being highly clumpy and turbulent from mergers, galaxies can show more ordered morphologies, including spiral arms and central bars. The study suggests these features act like “fuel pumps,” enabling gas to flow through the galaxy rather than remaining widely dispersed. By improving the efficiency of gas transport, spiral arms and bars support sustained, rapid star formation during cosmic noon.
Overall, the sources emphasize the connection between galaxy morphology—particularly spiral structure and bars—and the ability of gas to move and form stars during the epoch when star formation was at its maximum.
