https://indiaeducationdiary.in/university-of-saskatchewan-researcher-and-nobel-laureate-predict-source-of-comets-green-hue-in-1939/
Comet 2022 E3 (ZTF), which will be visible in early February, has been orbiting the outer solar system for tens of thousands of years. Because of its wide orbit, the comet is only seen from Earth every 50,000 years, making it a truly once-in-a-lifeti
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