This Day In History
This Day In History
Sunday, January 19, 2020

«helium»

Pierre Janssen

Pierre Janssen
(February 22, 1824 - December 23, 1907)
Pierre Jules César Janssen, usually known in French as Jules Janssen, was a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gas helium.
French astronomer, astronomer, helium
© 2011-2019, «www.this-day-in-history.net»