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On September 22, 2025, the autumnal equinox marks equal day and night globally, signaling the start of fall in the Northern Hemisphere. This year, it coincides closely with a partial solar eclipse on September 21 visible mainly in the Southern Hemisphere. Earlier, a total lunar eclipse on September 7-8 was widely observed across Asia, Australia, and parts of Africa and Europe.
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Multiple solar coronal mass ejections (CMEs) have caused geomagnetic storms across the US, UK, and parts of Canada, leading to spectacular aurora displays. The storms have disrupted satellite and communication systems and are expected to continue into Thursday, with visibility affected by weather conditions.
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Recent studies reveal a rogue planet, Cha 1107-7626, accreting gas and dust at an unprecedented rate, blurring lines between stars and planets. Meanwhile, the interstellar comet 3I/ATLAS, larger than previously thought, passed near Mars and is being closely observed. Finnish scientists also captured the first image of two black holes orbiting each other, confirming their binary nature.