A/2017 U1 The discovery of an asteroid with a record high eccentricity, A-2017 U1, is announced. It is almost certainly the first known example of an interstellar object. While initially thought to be a comet, it is now considered an asteroid.
Ukrainian crisis A parked scooter explosion in Kiev, thought to be an assassination attempt on Ukrainian Radical MP Ihor Mosiychuk, kills his bodyguard and one more man. Mosiychuk, political scientist Vitaliy Bala and a woman are injured.
Saudi Arabia Crown Prince Mohammad bin Salman of Saudi Arabia announces that a majority of Saudis want a return to moderate Islam. 70% of the kingdom is made up of residents under the age of 30 who welcome the idea of new reforms.
19th National Congress of the Communist Party of China At the National Congress of the Communist Party of China, Xi Jinping assumes his second term as General Secretary (China's paramount leader), and the political theory Xi Jinping Thought is written into the party's constitution.
Congressional Gold Medal The Congressional Gold Medal is awarded to Filipino American veterans of World War II more than 70 years after the end of that war.