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en.wikipedia.org/wiki/Helium

Helium, 2 He; Helium ... History Scientific discoveries. The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India.

education.jlab.org/itselemental/ele002.html

History and Uses: Helium, the second most abundant element in the universe, was discovered on the sun before it was found on the earth. Pierre-Jules-César Janssen, a French astronomer, noticed a yellow line in the sun's spectrum while studying a total solar eclipse in 1868. Sir Norman Lockyer, an English astronomer, realized that this line ...

www.webelements.com/helium/history.html

A French astronomer, Pierre-Jules-César Janssen (1824-1907), first obtained evidence for the existence of helium during the solar eclipse of 1868 in India when he detected a new yellow line (587.49 nm) in the solar spectrum very close to the yellow sodium D-line.

www.livescience.com/28552-facts-about-helium.html

Helium blimps weren't used much in World War I because of the cost of production, according to the ACS, but they became much more common in World War II, by which time the cost of helium had dropped.

www.britannica.com/science/helium-chemical-element

Helium: Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. The boiling and freezing points of helium are lower than those of any other known substance.

www.rsc.org/periodic-table/element/2/helium

Helium is the second most abundant element in the universe, but here on earth, it's rather rare. Most people guess that we extract helium from the air, but actually we dig it out of the ground. Helium can be found in certain parts of the world, notably in Texas, as a minor component in some sources of natural gas.

www.mcsweeneys.net/articles/a-brief-history-of-helium-to...

A Brief History of Helium to Be Read Aloud with the Aid of Helium. by Justin Dullum . Phrases intended to be read after inhaling helium are rendered in italics. More than just for use in festive balloons, helium, the second most abundant element in the universe, has many applications—from manufacturing to saving lives. ...

www.acs.org/.../landmarks/heliumnaturalgas.html

Today, helium is used in airships and balloons, low-temperature research, arc welding, lasers, nuclear reactors, and magnetic resonance imaging. Acknowledgments. Adapted for the internet from “The Discovery of Helium in Natural Gas,” produced by the National Historic Chemical Landmarks program of the American Chemical Society in 2000. Back ...

nautilus.fis.uc.pt/st2.5/scenes-e/elem/e00210.html

Then, it was verified that helium was a stable product of the radioactive elements desintegration. This led some scientists to conclude that the hellium present in Earth had that origin. Some others thought that the origin of helium on Earth was a survival of the "primordial helium".

www.encyclopedia.com/.../compounds-and-elements/helium

HeliumBackgroundHelium is one of the basic chemical elements. In its natural state, helium is a colorless gas known for its low density and low chemical reactivity. It is probably best known as a non-flammable substitute for hydrogen to provide the lift in blimps and balloons.