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May 12 in History 254 – Pope Stephen I succeeds Pope Lucius I, becoming the 23rd pope of the Catholic Church. 907 – Zhu Wen forces Emperor Ai into abdicating, ending the Tang dynasty after nearly three hundred years of rule.…

April 19 in History AD 65 – The freedman Milichus betrays Piso's plot to kill Emperor Nero and all the conspirators are arrested. 531 – Battle of Callinicum: A Byzantine army under Belisarius is defeated by the Persians at Raqqa…

April 12 in History 240 – Shapur I becomes co-emperor of the Sasanian Empire with his father Ardashir I. 467 – Anthemius is elevated to Emperor of the Western Roman Empire. 627 – King Edwin of Northumbria is converted to…

1 light year = ? 9.5×106 km 9.5×109 km 9.5×1012 km(Correct) 9.5×1018 km