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There is a claim that an Arab scholar in 1258 noted several recurrent appearances of a comet (or a type of comet), and though it's not clear if he considered it to be a single periodic comet, it …
17 thg 7, 2025 · When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that …
What happens when a comet gets close to the Sun? For most of a comets' orbit, the nucleus remains an inert lump of ice, but this changes as the comet nears perihelion, its closest …
25 thg 8, 2025 · Comet, a small body orbiting the Sun with a substantial fraction of its composition made up of volatile ices. Comets are among the most-spectacular objects in the sky, with their …
21 thg 8, 2025 · Michael Jaeger captured this recent image of Comet C/2025 A6 Lemmon. Used with permission. Comet Lemmon is one of 5 bright comets headed toward Earth. Read more …
17 thg 5, 2025 · What is a comet? A comet is a space object of ice and dust that orbits the Sun. When a comet is in the inner Solar System, it can be seen in the sky as a blurry spot with a tail. …
16 giờ trước · The comet will come closest to Earth on Oct. 20. There's hope that it may become bright enough to glimpse with the naked eye.
4 ngày trước · Unlocking the Comet’s Secrets Beyond its beauty, Comet 3I/ATLAS carries profound scientific significance. Astronomers sought more than images; they wanted its …
4 ngày trước · Comet是什麼？怎麼用？ Comet是Perplexity 7月9日推出的AI瀏覽器，結合其最具代表性的產品AI搜尋引擎Perplexity，只要將想知道的問題輸入對話框，AI就會搜尋多個來源， …
Examples are the 'Great Comet of 1680' (Kirch's comet, or C/1680 V1), the 'Great September Comet of 1882' (C/1882 R1), and the 'Daylight Comet of 1910' ('Great January Comet of 1910').
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