March 01
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1896 - Henri Becquerel discovers radioactive decay.
1966 - Venera 3 Soviet space probe crashes on Venus, becoming the first spacecraft to land on another planet's surface.
1980 - Voyager 1 probe confirms that 'Janus,' a moon of Saturn, exists.
1982 - The Soviet Venera 13 lands on Venus, and provides the first Venusian soil analysis.
