If axions exist, they behave very differently from normal matter. Because they are incredibly light and have no electric charge, they don't form atoms or rocks. However, theory suggests that if axions get cold enough, they can clump together into a strange quantum state called a Bose-Einstein Condensate. In this state, millions of particles act like a single giant wave. These clumps could form "Axion Stars." These objects would be invisible to telescopes because they don't emit light. They would