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Now you know where helium comes from!

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Try it yourself ↓

Where does helium come from?

▶ 5:23 video · Watch on YouTube

  1. 0:00 Start
  2. 0:45 Made in stars
  3. 1:26 Born inside rock
  4. 2:25 The rock trap
  5. 3:15 Why balloons float
  6. 4:11 Too precious to waste

Your turn

Follow the helium yourself

Play with helium!

Each lab is one part of the video. Tap, slide and see what happens.

Each lab isolates one step. They are simplified teaching sketches: the atom counts and balloon speeds are illustrative, the spectral lines, densities and uses are real values.

Tap the buttons and slide the slider.

1

Spot the new line

Helium's D3 line vs sodium

In 1868, sunlight showed a yellow line. Was it sodium? Compare the two.

The 1868 eclipse line sat near sodium's D1/D2 pair but didn't match it. Switch between the two spectra.

2

Fuse hydrogen

The proton-proton chain, simplified

Tap the Sun's core. Four hydrogen nuclei become one helium nucleus.

Four hydrogen nuclei end up as one helium-4 nucleus, releasing energy. (The real chain has several steps.)

31

Age a rock

Radiogenic helium over time

Wait and watch

Drag the time slider. How much helium builds up as uranium breaks down?

Each U or Th decay chain ends at lead and releases several alpha particles. Scrub through billions of years (counts illustrative).

Slide it. The tiny bits break, and yellow helium bits appear!

42

Take the lid off

Cap rock and reservoir

Put the lid on

Take the lid of tight rock away. Where does the helium go?

Without an impermeable seal, migrating helium reaches the surface and is lost. Toggle the cap rock.

Take the lid away. Where does the helium go? Put it back!

53

Fill the balloon

Buoyancy and density

Up or down?

Fill the balloon with air, helium or hydrogen. Which ones float?

Net lift depends on the density difference with the surrounding air. Compare the three gases.

Pick a gas. Does the balloon go up or stay down?

6

Where does it go?

US helium use, 2024

Tap a slice. How much helium goes to MRI scanners?

USGS end-use shares for 2024. Tap a slice for its share.

Where does helium come from?

Helium is the gas that makes party balloons float. Did you know it comes from deep under the ground?

Found in the Sun

Long ago, people split sunlight into a rainbow. They saw a special yellow line. It was a new gas! They called it helium, after an old name for the Sun. Stars like the Sun make helium too, but we can't get it from there.

Made inside rocks

Some rocks have tiny bits inside, too small to see. Very, very slowly, the bits break apart. Each time, a teeny piece flies out, and it turns into helium.

A lid of rock

Helium is so small that it wiggles up through the rock. Most of it floats away. But sometimes a hard rock sits on top, like a lid on a jar. The helium gets stuck underneath. People dig deep holes to bring it up.

Why balloons float

Helium is much lighter than air. So the air pushes the balloon up, like water pushes up a beach ball.

Safety rule: never breathe helium from balloons or tanks. It can be dangerous, and it can make you faint.
Did you know? When a balloon leaks, its helium floats up, up, up, and out into space. It never comes back! Doctors need helium to keep big MRI machines in hospitals very cold.

← More explainers

Where does helium come from? The short answer

Almost all the helium we use on Earth comes from deep underground. Rocks contain tiny amounts of natural radioactive elements, mainly uranium and thorium. Very slowly, their atoms break apart and throw out alpha particles. An alpha particle is two protons and two neutrons, which is exactly the nucleus of a helium atom. It picks up two electrons and becomes a new helium atom.3511

Over millions of years, some of that helium collects in the same underground rock traps as natural gas. When companies drill for the gas, they separate the helium out and sell it for everything from MRI scanners to party balloons.15

The helium in the rest of the universe has a different origin. Most of it was made in the first few minutes after the Big Bang, and stars like the Sun make more by fusing hydrogen.87

What is helium?

Helium is element number 2 on the periodic table, with the symbol He. It is a colourless, odourless, tasteless gas and a noble gas, which means it almost never reacts with anything. It is the second lightest element after hydrogen, and it turns into a liquid at about −269 °C, a lower temperature than any other element.346

Helium was found in the Sun first

Helium is the only element discovered in space before anyone found it on Earth. During a solar eclipse in 1868, the French astronomer Pierre Janssen split sunlight into a rainbow, called a spectrum, and saw a bright yellow line. At first it was taken for sodium, which also makes yellow lines. The same year, the English astronomer Norman Lockyer showed that the line didn't match sodium's two lines, and named the new element after Helios, the Greek god of the Sun.34

For more than 20 years nobody could find helium on Earth. Then in 1895, the chemist William Ramsay caught it in the gas released when a uranium mineral was dissolved in acid. That was the first clue to where Earth's helium comes from: it had been made inside the rock by radioactive decay.4 In 1903, a gas well in Kansas produced gas that "refused" to burn. It turned out to hold almost 2% helium, the first sign that natural gas could be a helium source.6

How is helium made in stars?

Helium makes up about about a quarter of the mass of ordinary matter in the universe, second only to hydrogen.3 Most of it formed in the first few minutes after the Big Bang, when the young universe was hot enough to squeeze protons and neutrons together.8 Since then, stars have added more. In the Sun's core, at about 15 million °C, hydrogen nuclei crash together. Through a chain of steps, four hydrogen nuclei end up as one helium nucleus. A tiny bit of mass turns into the energy that becomes sunlight.79 Want the full story? See how stars are formed.

But we can't collect helium from the Sun, so the helium we use has to come from somewhere closer.

How is helium made on Earth? Radioactive decay in rock

Natural radioactivity is all around us, in soil, rock and water, and it always has been.14 Rocks such as granite hold tiny amounts of uranium and thorium. Their atoms are unstable, so every now and then one breaks apart and shoots out an alpha particle. Alpha particles can't travel far: a sheet of paper stops them, and they travel only a few centimetres through air.1011 Inside a rock they stop almost at once, pick up two electrons, and become ordinary, harmless helium atoms.3

This happens incredibly slowly. It takes about 4.5 billion years for half of the uranium-238 in a rock to break down, roughly the age of the Earth.1213 The whole crust still makes about 3,000 tonnes of new helium a year, but it's spread through an enormous amount of rock.15 (The atom counts in the time-slider toy are illustrative, not real numbers.) To learn more about how splitting atoms releases energy, see how nuclear energy works.

Where helium comes fromHow it's madeCan we collect it?
Big BangProtons and neutrons fused in the first minutesNo, it's spread across the universe
Stars (like the Sun)Fusion: 4 hydrogen nuclei → 1 helium nucleusNo
Rocks in Earth's crustUranium and thorium decay → alpha particles → heliumYes, where it's trapped with natural gas
The airHelium leaking out of the groundRarely: only 1 part in 200,000

How helium gets trapped with natural gas

Helium atoms are tiny, so they slowly work their way upward through cracks and pores in the rock. Most of them reach the surface, mix into the air and eventually escape into space.15 But in a few places, a layer of tight, non-porous rock arches over a layer of porous rock like a lid. Gas rising from below gets stuck under the dome, and over millions of years a pocket of natural gas and helium builds up.155

Most natural gas holds only a trace of helium. It is usually worth extracting when the gas is more than about 0.3% helium, and some gas fields in the United States hold as much as 7.6%.5163

How is helium extracted?

  1. Drill: a well brings natural gas up from the trap.
  2. Chill: a processing plant cools the gas under high pressure until methane, nitrogen and the other gases turn to liquid. Helium stays a gas because it boils at a much lower temperature.
  3. Purify: the crude helium is cleaned further (for example by passing it over cold charcoal) to about 99.995% pure.
  4. Ship: it is sold as a compressed gas or as liquid helium.

31

Which countries produce the most helium?

Helium is produced in only a handful of countries. The figures below are the U.S. Geological Survey's estimates for 2024, in million cubic meters.12

CountryProduction 2024 (million m³)
United States81 (68 from natural gas + 13 from storage)
Qatar64
Russia17
Algeria11
Canada6
World totalabout 180

Why do helium balloons float?

A litre of air weighs about 1.2 grams. A litre of helium weighs only about 0.16 grams, so helium is roughly seven times lighter than air.194 The heavier air around a balloon pushes it upward, just like water pushes a beach ball up to the surface. Hydrogen is even lighter (about 0.08 grams per litre), but it catches fire easily. Helium never burns, which makes it the safe choice for balloons and blimps.18117 (In the balloon toy, the speeds are made up to show the idea; only the weights per litre are real.)

Safety: never breathe in helium from balloons or tanks. It pushes the oxygen out of your lungs, and without oxygen you can faint within moments.2021

Why is helium rare on Earth if it's common in space?

Helium is so light that Earth's gravity can't hold on to it. Once it's released, from the ground or from a leaky balloon, it rises to the top of the atmosphere and slowly escapes into space. That's why only about 1 part in 200,000 of the air is helium.35

Myths about helium

  • Myth: "Helium is made in factories." Earth's helium is made naturally by radioactive decay in rock and collected with natural gas. Nobody can make it cheaply.15
  • Myth: "Balloon helium comes from the air or the Sun." The air has almost none, and we can't reach the Sun's. It comes from gas wells.3
  • Myth: "It comes from radioactive decay, so it must be radioactive." Helium atoms are completely stable. The decay happened slowly, deep underground, long ago.3
  • Myth: "It's the second most common element, so it can't run out." It's common in space but rare on Earth, and helium we release escapes into space.5
  • Myth: "Breathing balloon helium is harmless fun." It can make you faint from lack of oxygen.20

What is helium used for?

In the United States in 2024, helium was used for lab and science gases (22%), lifting gas such as balloons and airships (18%), MRI scanners (17%), making computer chips and fibre optics (15%), welding (8%), aerospace (7%), leak detection (5%) and deep-sea diving (5%).1

MRI scanners use very strong superconducting magnets, and those only work when they are kept extremely cold. Liquid helium, at about −269 °C, does that job.617 For temperatures below about −256 °C (−429 °F), nothing can replace helium.1

Is helium running out?

Helium isn't about to vanish, but it is non-renewable on human timescales: new helium forms far too slowly to replace what we use, and what escapes into space never comes back.65 Supplies depend on a few gas fields, so there have been several shortages and big price jumps, which hit hospitals and science labs hard.517 The good news: liquid helium that boils away can be captured and turned back into liquid. More labs and hospitals now recycle it, and MRI makers are building magnets that need less.15

Frequently asked questions

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Sources

  1. U.S. Geological Survey, Mineral Commodity Summaries 2025: Helium
  2. USGS, Helium and Rare Gases Statistics and Information
  3. Britannica, Helium
  4. Royal Society of Chemistry, Periodic Table: Helium
  5. American Chemical Society, Helium: An Endangered Element
  6. Bureau of Land Management, About Helium
  7. NASA Science, Sun: Facts
  8. NASA Science, Universe overview
  9. Britannica, Proton-proton chain
  10. U.S. EPA, Radiation Basics
  11. U.S. NRC, Glossary: Alpha particle
  12. Britannica, Uranium-238
  13. USGS, Age of the Earth
  14. U.S. EPA, Radiation Sources and Doses
  15. A Review of the Sustainability of Helium (MDPI, 2024)
  16. USGS SIR 2021-5085, National Assessment of Helium Resources Within Known Natural Gas Reservoirs
  17. BBC Future, Why helium shortages are worrying the world (2025)
  18. Royal Society of Chemistry, Periodic Table: Hydrogen
  19. NASA Glenn Research Center, Properties of Air
  20. Britannica Kids, Helium
  21. BMJ, Imitating Mickey Mouse can be dangerous (2000)