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Trinity detonation Trinity was the code name given to the nuclear test that saw the first detonation of a nuclear weapon. The code name was assigned by J. Robert Oppenheimer, the director of the Los Alamos Laboratory, after a poem by John Donne. It was conducted on July 16, 1945, as part of the Manhattan Project on the Alamogordo Bombing and Gunnery Range in the Jornada del Muerto desert. The test used a Fat Man bomb of the same design as that detonated over Nagasaki. The complex design of the implosion-type nuclear weapon required a major effort from the Los Alamos Laboratory, and testing was required to allay fears that it would not work. Its detonation (video featured) produced the explosive power of about 20 kilotons of TNT (84 terajoules). The test site is now part of the White Sands Missile Range. It was declared a National Historic Landmark District in 1965, and listed on the National Register of Historic Places the following year. (This article* is part of a featured topic: History of the Manhattan Project.)* Recently featured: Manitoba William Hanna Heartburn Archive By email More featured articles About
Did you know...
A sketch of Preston Porter Jr. ... that despite the presence of 300 witnesses, an inquest concluded that the lynching of Preston Porter Jr. (pictured) was carried out "at the hands of parties unknown"? ... that a forest in northern Wisconsin was subject to nuclear-radiation testing in the 1970s? ... that a photograph of Lesotho sprinter Motsapi Moorosi was sent into space on the Voyager Golden Records? ... that a studio portrait of the Bundoo Girls, who belonged to a secret society in Sierra Leone, was taken by Alphonso Lisk-Carew and sold as a postcard to tourists? ... that architect Arthur Loveless was a collector of Chinese snuff bottles? ... that Formula One races in Golden Lap are simply colored dots traveling along a thick line? ... that a recent international aid vessel bound for Gaza counted among its crew Greta Thunberg and a French member of the European Parliament? ... that there was a 24-year gap between the first Romanian Olympian and the next? ... that Little Benjamin the Ruler is buried in the churchyard of St Anne's Church, Lewes, but nobody knows who he was? Archive Start a new article Nominate an article

In the news
Abdul Hakim Haqqani The International Criminal Court issues arrest warrants for Taliban leaders Hibatullah Akhundzada and Abdul Hakim Haqqani (pictured) over their alleged persecution of women in Afghanistan. Flooding in Central Texas, United States, leaves at least 130 people dead. Astronomers announce the discovery of 3I/ATLAS, an interstellar object passing through the Solar System. The Vera C. Rubin Observatory in Chile releases the first light images from its new 8.4-metre (28 ft) telescope. Ongoing: Gaza war Russian invasion of Ukraine timeline Sudanese civil war timeline Recent deaths: Frank Barrie Ihor Poklad Glen Michael Ian Blair Lee Elia Bradman Weerakoon Nominate an article
On this day...
July 16 Phạm Ngọc Thảo 1790 – President George Washington signed the Residence Act, selecting a new permanent site along the Potomac River for the capital of the United States, which later became Washington, D.C. 1950 – Korean War: A Korean People's Army unit massacred 31 prisoners of war of the U.S. Army on a mountain near the village of Tuman. 1965 – South Vietnamese Colonel Phạm Ngọc Thảo (pictured)—an undetected communist spy—was reported dead due to injuries sustained during his capture, but it is generally assumed he was killed on the orders of military officials. 1990 – A 7.8 M_S earthquake struck the densely populated Philippine island of Luzon, killing an estimated 1,621 people. 2008 – A tainted milk powder scandal broke in China which ultimately involved an estimated 300,000 victims, the vast majority infants, with 54,000 hospitalized with kidney problems and six deaths. Mary Todd Lincoln (d. 1882) Stan McCabe (b. 1910) Will Ferrell (b. 1967) Alcides Ghiggia (d. 2015) More anniversaries: July 15 July 16 July 17 Archive By email List of days of the year About

Today's featured picture

Anne of Cleves (German: Anna von Kleve; 28 June or 22 September 1515 – 16 July 1557) was Queen of England from 6 January to 12 July 1540 as the fourth wife of Henry VIII. Anne outlived the rest of Henry's wives.

Painting credit: Hans Holbein the Younger

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