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1610 – Italian astronomer, physicist and engineer Galileo Galilei makes his first observation of the four Galilean moons: Ganymede, Callisto, Io and Europa, although he is not able to distinguish the last two until the following day. 1904 – The distress signal “CQD” is established only to be replaced two years later by “SOS”. More…

Why did Ostrogoths King Theodoric the Great (454-526) voluntarily spend 11 years as a Roman hostage?