June 1: Eleven members of the royal family of Nepal, including the king and queen, are killed by Crown Prince Dipendra, who wounds himself and dies three days later.
Radovan Karadžić is found guilty of 10 of 11 counts of war crimes, genocide and crimes against humanity during the Bosnian War and is sentenced to 40 years in prison.
Macedonia and Greece reach a historic agreement in the Macedonia naming dispute, in which the former is renamed in 2019 to the 'Republic of North Macedonia'.
September 19: 'Storm Area 51, They Can't Stop All Of Us' Facebook event results in 1500 people turning up to the festival, and approximately 150 people appearing at the main event.
July 28: Former Prime Minister of Malaysia Najib Razak is found guilty of all seven charges in the first of five trials on the 1MDB scandal, being jailed 12 years and fined RM210 million as a result.
July 30: NASA successfully launches its Mars 2020 rover mission to search for signs of ancient life and collect samples for return to Earth.
The Royal Astronomical Society announces the detection of phosphine in Venus' atmosphere, which is known to be a strong predictor for the presence of microbial life.
October 22: The Geneva Consensus Declaration on Promoting Women's Health and Strengthening the Family is signed by government representatives from 34 countries.
November 3: The 2020 United States presidential election occurs. Despite the pandemic, early voting and other factors result in the highest voter turnout since 1900, and a record of over 155 million votes cast. Although Joe Biden is declared the winner on November 7, Donald Trump leads an unprecedented effort to prevent official recognition of his defeat, culminating on January 6 the next year.
December 8: Nepal and China officially agree on Mount Everest's actual height, which is 8,848.86m.
December 18: Media outlets report that astronomers have detected a radio signal, BLC1, apparently from the direction of Proxima Centauri, the closest star to the Sun.
December 21: A great conjunction of Jupiter and Saturn occurs, with the two planets separated in the sky by 0.1 degrees. This is the closest conjunction between the two planets since 1623.
The COVID-19 pandemic, which began spreading late in the prior year, spreads from China to the vast majority of the world's inhabited areas, infecting at least 81 million and killing at least 1.8 million people in its first year.
January 13: In Lyon, France, the first transplant of both arms and shoulders is performed on an Icelandic patient at the Édouard Herriot Hospital.
January 13 – February 13: Donald Trump is impeached for a second time following the events of January 6, but is acquitted again after his trial from February 9–13.
January 20: Joe Biden is inaugurated as President of the United States. Kamala Harris, sworn in as vice president, becomes the first woman, first African American and first Asian American to be vice president.
April 24: Following an international search and rescue effort, the Indonesian navy reports the sinking of KRI Nanggala with 53 crew members, the largest loss of life aboard a submarine since 2003.
July 18: An international investigation reveals that spyware sold by Israel's NSO Group to different governments is being used to target heads of state, along with thousands of activists, journalists and dissidents around the world.
September 14: North Korea demonstrates two short-range ballistic missiles that land just outside Japan's territorial waters; hours later South Korea demonstrates its first submarine-launched ballistic missile.
September 16: Inspiration4, launched by SpaceX, becomes the first all-civilian spaceflight, carrying a four-person crew on a three-day orbit of the Earth.
October 3: The International Consortium of Investigative Journalists and assorted media partners publish a set of 11.9 million documents leaked from 14 financial services companies known as the Pandora Papers, revealing offshore financial activities that involve multiple current and former world leaders.
The COVID-19 pandemic continues, infecting more than 220 million and killing at least 3.6 million people in its second year. The true totals of infected and dead are estimated to be much higher.
September 27 – 30: Hurricane Ian impacts Cuba and the US, causing catastrophic damage to both nations, killing at least 157 people, 16 missing, and leaving millions without power, including the entirety of Cuba.
President Biden signs the Respect for Marriage Act, which federally protects same-sex and interracial marriages by requiring states to recognize each others' marriage standards.
June 23 – 24: The Wagner Group rebellion against the Russian government occurs as a result of conflict with the Russian Ministry of Defense over the use of the group in the Russian invasion of Ukraine.
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