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Word of the day - Sep 19: supernova
(en.wiktionary.org)
- (astronomy) A bright and powerful explosion of a massive star which is sudden but brief, and causes the ejection of most or all of the star's matter and the emission of radiation; afterwards, the star becomes a black hole or a neutron star, or is destroyed.
- (figurative) Something which is brilliant or explosive.
โ Today, the Saturday nearest the first quarter moon between mid-September and mid-October in 2026, is the second of two Astronomy Days in the year. The event was started in 1973 by Doug Berger, the president of the Astronomical Association of Northern California.
NASA's Chandra Releases 'Red, White, and Blue' Universe for US 250th (Cassiopeia A composite).jpg
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A composite image of Cassiopeia A, a supernova remnant in the constellation Cassiopeia, imaged by the Chandra X-ray Observatory, a space telescope orbiting Earth.
https://en.wiktionary.org/wiki/Wiktionary:Word_of_the_day/2026/September_19