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.
Automatic street lights first appeared in New Milford, Connecticut, US.
Dmitry Medvedev was elected as the third President of Russia.
The Republic of Texas declared independence from Mexico during the Texas Revolution.
The US spacecraft Pioneer 10 launched.
