Tiananmen Square demonstration begins: In Beijing, China, pro-democracy demonstrators gather at Tiananmen Square to stage peaceful protests for democratic reforms and greater political accountability. The protests, led by students and intellectuals, demand greater democracy, freedom of speech, and an end to political corruption. This marks the beginning of the Tiananmen Square protests movement.
Apollo 10 re-launch: NASA relaunches Apollo 10 after the successful abort of its mission 20 years earlier. This was part of a commemoration of NASA's human spaceflight program and to conduct additional testing related to future missions.
Operation Just Cause Ends: Operation Just Cause, United States invasion of Panama initiated on December 20, 1989, officially comes to an end. United States military forces leave Panama and Manuel Noriega is captured two days later.
United Kingdom's Broadcasting Act passes: The Broadcasting Act of 1990 was given Royal Assent in the United Kingdom. This Act paved the way for the formation of ITV plc, as well as independent television and independent national radio (commercial versions of the previously public-service funded independent television and National Radio respectively).
Opening of The Louvre Pyramid French President Francois Mitterrand inaugurates the new glass "Glass Pyramid" entrance hall designed by I. M. Pei at the Louvre Museum in Paris, France.