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Helium was identified in the Sun decades before scientists isolated it on Earth. In 1868, Pierre Janssen and Norman Lockyer independently detected an unfamiliar yellow line in sunlight and inferred that it came from an unknown element. William Ramsay’s work with gas from a mineral in 1895 supplied the terrestrial confirmation: its spectrum contained the same distinctive line.
How was helium discovered?
Helium’s discovery depended on spectroscopy: splitting light into a spectrum and studying its pattern of lines. Each element can produce characteristic spectral lines, so scientists could use light to infer what was present in a source even when they could not obtain a sample. Gustav Kirchhoff’s work on spectral analysis helped establish this approach for studying the Sun. In helium’s case, however, seeing a matching line was evidence for an element, not the same thing as isolating it.
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Why was helium discovered in the Sun before it was found on Earth?
The Sun’s spectrum could be examined remotely, while terrestrial helium had to be recognized in a gas sample. In 1868, the solar evidence was unusually clear: an unfamiliar yellow line appeared in the Sun’s spectrum, close to—but distinct from—the lines of sodium. It did not match any element then known. Scientists could therefore propose an unknown element from its light long before they had isolated that element on Earth.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat Janssen and Lockyer saw in 1868
Janssen’s eclipse observation
On 18 August 1868, French astronomer Pierre Janssen observed a solar eclipse at Guntur, India. In the Sun’s spectrum he noticed the bright yellow line. Its proximity to sodium’s lines made comparison possible, but it was not a sodium line. Janssen reasoned that the relevant solar light might be observed without waiting for another eclipse if it could be isolated.
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Lockyer’s daylight observation
English astronomer Norman Lockyer independently observed solar prominences in broad daylight on 20 October 1868. His observation was distinct from Janssen’s eclipse work. According to the American Physical Society’s account, the two men’s papers reached the French Academy of Sciences on the same day, and both received credit for the discovery.
Lockyer worked with chemist Edward Frankland to compare spectra of known elements with the unfamiliar solar line. That comparison mattered: the claim was not simply that a yellow mark had appeared, but that it did not correspond to an element known from laboratory spectra. Their 1868 paper referred to the element that would be called helium, but did not yet use that name, as the Norman Lockyer Observatory’s history of Lockyer’s spectral work explains.
How the evidence developed from 1868 to 1895
| Date | Observation or experiment | What it established |
|---|---|---|
| 18 August 1868 | Janssen observed an unfamiliar yellow line in the Sun’s spectrum during an eclipse at Guntur, India. | A spectral clue pointing to an element not then known. |
| 20 October 1868 | Lockyer independently observed solar prominences in daylight in England; both papers arrived at the French Academy that day, according to the APS account. | Independent support for the solar observation and inference. |
| 1882 | Italian physicist Luigi Palmieri saw the telltale yellow line while analyzing lava from Mount Vesuvius. | An early terrestrial indication, not the same kind of evidence as isolating and identifying a gas. |
| 1895 | William Ramsay obtained an unusual gas from cleveite, a uranium-bearing ore, and studied its spectrum. | A terrestrial gas with the distinctive line that connected the laboratory evidence to the solar discovery. |
What Ramsay’s 1895 experiment confirmed
In 1895, Scottish chemist William Ramsay was seeking argon when he treated cleveite with acids and obtained an unusual gas. Its spectrum showed the distinctive yellow line associated with the Sun. Ramsay sent a sample to Lockyer for verification; the American Physical Society recounts Lockyer’s reaction as “glorious yellow effulgence.” Matching the laboratory gas’s spectrum to the solar line linked the terrestrial substance to the element inferred from the Sun.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the element is called helium
Lockyer named the element helium from helios, the Greek word for the Sun. The name preserves the unusual order of discovery: the element was first inferred from sunlight, then identified in a terrestrial gas. The two stages relied on the same spectral signature, but answered different questions—first whether the Sun showed evidence of an unknown element, and later whether a gas on Earth produced that same line.
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