What happened on 20 september

September 20th! There have been many significant events that occurred on this day throughout history. Here are a few:

1. 1967: The Outer Space Treaty is signed by 60 countries, including the United States, the Soviet Union, and the United Kingdom. The treaty prohibits the deployment of nuclear weapons and other weapons of mass destruction in outer space.
2. 1973: The United States launches the Pioneer 11 spacecraft, which becomes the first spacecraft to visit Saturn and its moons.
3. 1989: The Soviet Union launches the Phobos 2 spacecraft, which is intended to study Mars and its moons. Unfortunately, the spacecraft fails to enter Mars orbit and is lost.
4. 1994: The North American Free Trade Agreement (NAFTA) goes into effect, creating a free trade zone between the United States, Canada, and Mexico.
5. 2008: The Large Hadron Collider (LHC), a massive particle accelerator, is officially inaugurated at CERN in Geneva, Switzerland.
6. 2011: The United States ends its military involvement in Iraq, marking the end of the Iraq War.
7. 2017: Hurricane Maria makes landfall in Puerto Rico, causing catastrophic damage and loss of life.

These are just a few of the many events that have occurred on September 20th. Is there a specific year or event you'd like to know more about?