Edwin 'Buzz' Aldrin, who would become the second human to walk on the Moon during Apollo 11, was born in Montclair, New Jersey.

Astronomer Clyde Tombaugh, comparing photographic plates at Lowell Observatory, confirmed a moving object that would soon be announced as the ninth planet, Pluto.

Clyde Tombaugh, a 24-year-old self-taught astronomer, spotted a faint moving speck on photographic plates at Lowell Observatory, identifying the object later named Pluto.

Lowell Observatory announced the name Pluto for the ninth planet, chosen from a suggestion by 11-year-old Venetia Burney of Oxford, England.

Mahatma Gandhi set out from Sabarmati Ashram with dozens of followers on a 240-mile walk to the sea to defy Britain's salt tax.

Lowell Observatory announced that 24-year-old Clyde Tombaugh had discovered a ninth planet, spotted by comparing photographic plates taken weeks earlier.

News of Clyde Tombaugh's discovery of Pluto, made weeks earlier at Lowell Observatory, spread globally, briefly crowning a ninth planet.

The Lowell Observatory announced the discovery of Pluto, a new ninth planet found by 24-year-old astronomer Clyde Tombaugh.

Turkey formally renames its largest city Istanbul, part of Mustafa Kemal Atatürk's sweeping campaign to modernize and secularize the young republic.

Babe Ruth signed a two-year contract with the New York Yankees worth $80,000 per season, making him the highest-paid player in baseball during the Great Depression.

The inaugural FIFA World Cup began in Montevideo, Uruguay, with France defeating Mexico 4–1 in the tournament's first match.

The inaugural FIFA World Cup began in Montevideo, Uruguay, with France defeating Mexico 4–1 in the tournament's first-ever match.

Uruguay defeated Argentina 4-2 in Montevideo to win the inaugural FIFA World Cup, cementing football's status as a global spectacle.

Henri Desgrange's Tour de France crowned French rider André Leducq champion in a race reorganized around national teams instead of commercial sponsors.

Neil Armstrong, who would become the first human to walk on the Moon, was born on a farm near Wapakoneta, Ohio.

The Lowell Observatory announced that the newly discovered ninth planet would be named Pluto, a suggestion from an 11-year-old English schoolgirl named Venetia Burney.

Ernest Lawrence files a patent application for the cyclotron, the circular particle accelerator that would transform nuclear physics.