Helium

Helium is the second-most-abundant element in the universe — only hydrogen is more common. It accounts for about a quarter of all the “normal” mass in the universe — the stuff that makes up stars, planets, and people.
Yet here on Earth, it’s quite rare. In fact, there’s a shortage of it. And that’s affecting everything from party balloons to rocket launches.
On Earth, helium is mainly mixed with natural gas. And because it’s lighter than air, if it reaches the atmosphere it’s likely to escape into space. So it takes special equipment and techniques to refine and store it.
Helium has many scientific uses. It fills the giant balloons that carry telescopes to high altitudes, and pressurizes the fuel tanks on rockets. In its liquid form, at a temperature just above absolute zero, it chills the superconducting magnets used in particle colliders. It also cools detectors on telescopes. And it’s a critical resource for many experiments in chemistry and physics.
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