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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The US spacecraft Pioneer 10 launched.
US President Joe Biden announced that Americans no longer needed to wear masks against COVID-19, following guidance released by the CDC.
Dmitry Medvedev was elected as the third President of Russia.
The Republic of Texas declared independence from Mexico during the Texas Revolution.
Chemical elements Moscovium, Tennessine, and Oganesson were added to the Periodic Table of Elements.
