Trang Nơ
@trangno
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Alexander the Great founded **numerous settlements** on his military campaigns *(map pictured)*, during which he created one of the largest empires in history. His settlements have been the subject of intense debate, as the accounts of historical scholars differ wildly and are often contradictory. Plutarch provides the maximum estimate of seventy cities in his *Life of Alexander*, but most texts attest to between ten and twenty foundations, which Alexander named after himself or his close companions. The accounts of Alexander's campaigns, primarily those of Arrian, Plutarch, Diodorus, Curtius Rufus, and Justin, help to provide evidence. The most important of the settlements he founded include Alexandria in Egypt, Boukephala and Nikaia on the Indus River, Alexandria Eschate in Central Asia, and Alexandria Ariana in modern Afghanistan 0 reply
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**C/2022 E3 (ZTF)** is a long-period comet from the Oort cloud that was discovered by the Zwicky Transient Facility in March 2022. The comet has a bright green glow around its nucleus, due to the effect of sunlight on diatomic carbon and cyanogen. Its comet nucleus is estimated to be about 1 kilometre (0.62 mi) in size, rotating every 8.5 to 8.7 hours. Its tails of dust and gas extended for millions of kilometres and, during January 2023, an anti-tail was also visible. The comet reached perihelion on 12 January 2023, at a distance of 1.11 AU (166 million km; 103 million mi), and its closest approach to Earth was on 1 February 2023, at a distance of 0.28 AU (42 million km; 26 million mi). The comet reached magnitude 5 during this approach, and was visible with the naked eye under moonless dark skies. This photograph of C/2022 E3 (ZTF), released by the Italian National Institute for Astrophysics, was taken on 27 January 2023. 0 reply
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