Jupiter’s moon was found to have a liquid ocean under a thick crust of ice.
The Galileo probe made the discovery.
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Chemical elements Moscovium, Tennessine, and Oganesson were added to the Periodic Table of Elements.
The musical 'The Sound of Music,' starring Julie Andrews, premiered.
The Concorde airplane was tested for the first time in Toulouse, France.
US President Joe Biden announced that Americans no longer needed to wear masks against COVID-19, following guidance released by the CDC.
The Republic of Texas declared independence from Mexico during the Texas Revolution.
