On this day in 1868, French astronomer Pierre Janssen discovered an unknown element while observing a solar eclipse.See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.

On this day in 1868, French astronomer Pierre Janssen discovered an unknown element while observing a solar eclipse. See omnystudio.com/listener for privacy information.

On this day in 1868, French astronomer Pierre Janssen discovered an unknown element while observing a solar eclipse.See <a href="https://omnystudio.com/listener" rel="noopener noreferrer">omnystudio.com/listener</a> for privacy information.

Helium is discovered during a solar eclipse - August 18th, 1868

From the desk of “Stuff You Missed in History Class,” “This Day in History Class” quickly recounts a tidbit from today’s events in history.

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Helium is discovered during a solar eclipse - August 18th, 1868

Helium is discovered during a solar eclipse - August 18th, 1868