AI Insight
Research indicates that galaxies cease their growth after reaching a certain mass threshold, regardless of available gas and raw materials for star formation. Scientists have observed this phenomenon across multiple galaxies but have not yet identified the mechanism that triggers this shutdown. The study focuses on understanding what causes galaxies to stop forming new stars once they exceed this critical mass limit.
Why it matters
Understanding why galaxies stop growing is fundamental to comprehending galaxy evolution and the life cycle of cosmic structures. This research could explain why the universe contains galaxies of varying sizes and why some massive galaxies appear "dead" despite having abundant star-forming material.
Above a certain threshold, galaxies stop growing , no matter how much raw material they have on hand. The question is: what flips the switch?
Source: Do galaxies have a 'kill switch' that makes them stop growing?