J. 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. Date: September 1, 1939 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1939 📅 On This Day (Today)

World War II: Germany and Slovakia invade Poland, beginning the European phase of World War II. Date: September 1, 1939 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1939 📅 On This Day (Today)

World War II: Launch of Operation Ratweek, complicating German retreat. Date: September 1, 1944 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1944 📅 On This Day (Today)

TWA Flight 529 crashed shortly after takeoff from Midway Airport in Chicago, killing all 78 people on board. At the time, it was the deadliest single plane disaster in U.S. history. Date: September 1, 1961 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1961 📅 On…

Six-Day War: The Khartoum Resolution is issued at the Arab Summit, and eight countries adopt the "three 'no's against Israel". Date: September 1, 1967 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1967 📅 On This Day (Today)

A coup in Libya brings Muammar Gaddafi to power. Date: September 1, 1969 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1969 📅 On This Day (Today)

A 76-hour multinational rescue effort in the Celtic Sea resulted in the Rescue of Roger Mallinson and Roger Chapman. Date: September 1, 1973 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1973 📅 On This Day (Today)

The SR-71 Blackbird sets (and holds) the record for flying from New York to London in the time of one hour, 54 minutes and 56.4 seconds at a speed of 1,435.587 miles per hour (2,310.353 km/h). Date: September 1, 1974 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day…

Central African President David Dacko is ousted from power in a bloodless military coup led by General André Kolingba. Date: September 1, 1981 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1981 📅 On This Day (Today)

The United States Air Force Space Command is founded. Date: September 1, 1982 Read more on Wikipedia → 📅 Other events on September 1 📅 Events on this day in 1982 📅 On This Day (Today)