NASA launched the Viking 1 planetary probe toward Mars.
The Viking 1 was the first successful Mars lander in history.
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The World Health Organization (WHO) announced that measles cases were at an all-time record high, with 41,000 in the first half of the year alone.
Exiled Soviet leader Leon Trotsky was assassinated with an ice axe in Mexico City.
The Iran-Iraq war ended in a stalemate after nearly eight years of conflict.
England was defeated by South Africa, who became top of the world Test cricket rank.
Mother Teresa contracted malaria and spent one week in hospital in New Delhi, India.
