November 03
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1906 – "SOS" was agreed to be Earth's 'universal distress signal,' in a document signed by representatives of 27 nations.
1957 – The Soviet Union launches Sputnik 2. On board is the first animal to enter orbit, a dog named Laika.
1973 – NASA launches Mariner 10 toward Mercury. Roughly three months later, it becomes the first space probe to reach the planet.
