Mariner IX took two photos of Mars’ north pole.
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The Provisional Irish Republican Army attempted to assassinate British Prime Minister Margaret Thatcher.
Organized by the Columbian Order, the first recorded 'Columbus Day' was celebrated on this day.
The Pledge of Allegiance was first recited in American schools.
The USSR's Voskhod 1 spacecraft became the first spaceflight with multiple crew members.
The six billionth living human being was born.