NASA launched the Viking 1 planetary probe toward Mars.
The Viking 1 was the first successful Mars lander in history.
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A suicide bomber killed 57 people while injuring 66 in Gaziantep, Turkey.
Exiled Soviet leader Leon Trotsky was assassinated with an ice axe in Mexico City.
The ''LZ 127 Graf Zeppelin” returned to Lakehurst, New Jersey, after being the first airship to circumference the earth in one journey.
NASA announced they would send a ship to Jupiter's moon, Europa, to look for extraterrestrial life.
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.
