September 1, 1939

1939Rico Carty, Dominican baseball player (died 2024)^[†]

Ricardo Adolfo Jacobo Carty, nicknamed "Beeg Boy", is a Dominican former professional baseball player. He played in Major League Baseball as an outfielder from 1963 to 1979, most prominently as a member of the Atlanta Braves where he helped the franchise win its first National League Western Division title in 1969. Carty had a career batting average of .299 and, was the 1970 National League (NL) batting champion with a .366 batting average. He earned his starting role in the 1970 All-Star Game as a write-in candidate.

1939Lily Tomlin, American actress, comedian, screenwriter and producer^[†]

Mary Jean "Lily" Tomlin is an American actress, comedian, writer, singer, and producer. Tomlin started her career in stand-up comedy and sketch comedy before transitioning her career to acting across stage and screen. In a career spanning over fifty years, Tomlin has received numerous accolades, including seven Emmy Awards, a Grammy Award, two Tony Awards, and a nomination for an Academy Award. She was also awarded the Kennedy Center Honor in 2014 and the Screen Actors Guild Life Achievement Award in 2017.

1939World War II: Germany and Slovakia invade Poland, beginning the European phase of World War II.^[†]

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

1939J. Robert Oppenheimer and his student Hartland Snyder publish the Oppenheimer–Snyder model, proving for the first time in contemporary physics how black holes could develop.^[†]

J. Robert Oppenheimer was an American theoretical physicist who served as the director of the Manhattan Project's Los Alamos Laboratory during World War II. He is often called the "father of the atomic bomb" for his role in overseeing the development of the first nuclear weapons.