Radiogenic dating techniques

It was first detected as an unknown yellow spectral line signature in sunlight during a solar eclipse in 1868 by Georges Rayet, Janssen is often jointly credited with detecting the element along with Norman Lockyer.

Previously, terrestrial helium—a non-renewable resource, because once released into the atmosphere it readily escapes into space—was thought to be in increasingly short supply.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.A total of 5,700 m Some of this gas was used in the world's first helium-filled airship, the U. Navy's C-7, which flew its maiden voyage from Hampton Roads, Virginia, to Bolling Field in Washington, D.C., on December 1, 1921, nearly two years before the Navy's first rigid helium-filled airship, the Naval Aircraft Factory-built USS Shenandoah, flew in September 1923.Its boiling point is the lowest among all the elements.


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