NASA's Mariner 9 became the first spacecraft to orbit another planet when it entered Mars' orbit.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
Prospero became the first British satellite to have been launched successfully by a British rocket.
The National Oceanic and Atmospheric Administration's ITOS-B weather satellite launched atop a Delta rocket.
Walt Disney World Resort officially opened in Florida.
Athlete Beth Bonner became the first woman to win the New York City Marathon with a time of 2:55:22.
Rolling Stone Magazine featured the Hulk on the front cover.
John Lennon released his second album, 'Imagine.'
John Lennon's most iconic hit, 'Imagine,' was released in the UK.
John Lennon and Yoko Ono left the UK and headed to New York City, US.
Bahrain declared independence from Britain.
The Society for American Baseball Research was founded in Cooperstown, New York.
After being the first man to sail the world non-stop in the wrong direction, Chay Blyth returned to the UK.
Astronauts on Apollo 15 discovered a rock that could date back to the birth of the moon.
NASA's Apollo 15 Lunar mission landed on the Moon's surface with the first Lunar Rover.
America banned all advertisements of cigarettes on TV and radio.