No celebration would be complete without colorful, helium-filled balloons bobbing overhead.But in recent years, news of a dwindling supply of the gas caused prices-and concern over the future availability of the element-to surge.So, the question you might be asking is, can’t we just get more helium? After all, helium is the second-most abundant element in the entire universe after hydrogen.Hydrogen and helium together make up about 99.9% of the universe’s measurable mass.A significant portion of this mass is found in stars, but far more hydrogen and helium exist in the space between stars than in the stars themselves-about four times as much.
展开▼