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Featured article Umbriel imaged by Voyager 2 Umbriel is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell. Named after a character in the 1712 poem The Rape of the Lock by Alexander Pope, Umbriel is composed mainly of ice with a substantial fraction of rock. It may be differentiated into a rocky core and an icy mantle. Its surface, the darkest among Uranian moons, appears to have been shaped mostly by impacts, but the presence of canyons suggests early endogenic processes. This shows Umbriel may have undergone an early endogenically driven resurfacing event that erased its older surface. Covered by numerous impact craters reaching 210 km (130 mi) in diameter, Umbriel is the second-most heavily cratered satellite of Uranus after Oberon. Like all moons of Uranus, Umbriel likely formed from an accretion disk that surrounded the planet just after its formation. The only close study of Umbriel was conducted in January 1986 by Voyager 2, which captured images of about 40 percent of its surface during the spacecraft's flyby of Uranus. (Full article...) Recently featured: Wells Cathedral The Dark Pictures Anthology: House of Ashes Takin' It Back Zimmerman Telegram Zimmerman Telegram On February 24, .. 1582 - Pope Gregory XIII announced the Gregorian calendar. 1803 - Marbury v. Madison established judicial review in the U.S. 1917 - The Zimmermann Telegram was delivered, complicating World War I. 1999 - Arizona executed German national Karl LaGrand. Recent days: February 23 - February 22 More events in history... Did you know ...? Wuhan trolleybus on route 1 ... that for nearly 65 years, Wuhan trolleybus route 1 (pictured) included a loop around a statue of Sun Yat-sen? ... that a Stradivarius cello once owned by Ernest de Munck is now named after him? ... that the Félag hljómplötuframleiðenda tried to close the file-sharing website Istorrent in 2007–2008, but the Supreme Court of Iceland dismissed the case? ... that a banker was named the prime minister of Equatorial Guinea after his predecessor resigned during an economic crisis? ... that while shooting his first short film, Jean-Luc Godard was barred from his mother's funeral for stealing? ... that Brenden Bates "loves moving people against their will"? ... that a fort in Baguia was restored to be converted into tourist accommodation? ... that The New York Times Simulator was inspired by its creator's frustration with media coverage of the Israel–Hamas war?	In the news Yahya Sinwar Moldova votes to amend its constitution to include the aim of becoming a European Union member state. Yahya Sinwar (pictured), the leader of Hamas, is killed in a firefight with Israeli forces in Gaza. The Nobel Memorial Prize in Economic Sciences is awarded to Daron Acemoglu, Simon Johnson, and James A. Robinson for their comparative studies of prosperity between nations. The Europa Clipper spacecraft is launched to investigate Europa, an icy moon of Jupiter. Ongoing: Israel–Hamas war Israel–Hezbollah conflict Russian invasion of Ukraine timeline Sudanese civil war timeline Recent deaths: Fernando Valenzuela Rick Nolan Matia Chowdhury Ginés González García Garbis Aprikian Sukh Dev Holidays {{Holidays}} Obituaries Italian cyclist Marco Pantani died suddenly at a hotel in Rimini, Italy on February 14. Former Chechen president Zelimkhan Yandarbiyev was killed in an apparent car bomb explosion on February 13. Former leader of the Canadian liberal party, Claude Ryan, died from stomach cancer on February 9 at age 79. More recent deaths...
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