Was helium discovered on the Sun before it was found on Earth?
What most people think: Most people assume helium, like most elements, was discovered on Earth in a lab or a gas well before anyone spotted it anywhere else.
Guess before the Apple does
Just tell me the answer
Yes. Helium was first detected as a mysterious yellow line in sunlight during a solar eclipse in 1868, and it wasn't isolated on Earth until 1895, about 27 years later.
Helium is the stuff of party balloons and squeaky voices, so it feels like an ordinary, down-to-earth element. It is anything but. Its very name comes from the Sun, and for good reason: scientists found it in the Sun decades before anyone managed to bottle it on Earth.
The short answer
Yes. Helium was first detected in 1868, as an unexplained line in the light of the Sun. It was not isolated on Earth until 1895, so for about 27 years it was an element known only from sunlight.
The real story
On 18 August 1868, a total solar eclipse crossed India. The French astronomer Jules Janssen, observing from Guntur, pointed a spectroscope at the Sun’s glowing outer layers. A spectroscope splits light into its colours, and each element leaves a distinctive set of bright lines, like a barcode. Janssen saw a bright yellow line at a wavelength of about 587.49 nanometres. Several other observers recorded it too.
A couple of months later, on 20 October 1868, the English astronomer Norman Lockyer saw the same yellow line. Lockyer labelled it D3 and made a bold suggestion: it came from an element that did not yet exist on any chemist’s list. He named it helium, from the Greek word for the Sun, helios. By his own account he was so struck by what he saw that he left the observatory to fetch his wife so she could confirm it.
Not everyone was convinced. A brand-new element, seen only in sunlight, was a hard sell, and Lockyer’s idea was doubted and even mocked. A hint arrived in 1881, when the Italian physicist Luigi Palmieri detected the same D3 line in material from an eruption of Mount Vesuvius. But the clinching proof came on 26 March 1895, when the Scottish chemist William Ramsay treated a radioactive mineral called cleveite with acid and isolated a gas whose spectrum showed that same yellow line. In the same year, Per Teodor Cleve and Abraham Langlet in Uppsala, Sweden, independently isolated it too. Ramsay sent Lockyer a sample. The Sun’s element had finally come down to Earth.
The final twist: the element that once seemed exotic turned out to be the second most abundant in the observable universe, after hydrogen, making up roughly a quarter of all ordinary matter by mass. Most of it was forged in the first minutes after the Big Bang.
Why people get it wrong
Most elements were found the hands-on way, by chemists heating, dissolving and weighing rocks and gases. It is natural to assume helium followed the same path. Its everyday familiarity, in balloons and airships, makes it feel terrestrial. But helium was hiding in plain sight in the brightest object in the sky, and a spectroscope could read its signature from across the solar system long before a chemist could catch it in a flask.
The Sole sums it up: “Helium was found on the Sun twenty-seven years before anyone found it here. Like losing your keys and finding them on the Sun.”
Sources
Fact-checked 31 Oct 2026. Spotted a mistake? Tell us and we'll fix it in public.
