Scientists expected the sun to enter a period of historic quiet after 2008, when solar activity hit its weakest level on record — instead it reversed course entirely and has been growing more active ever since, in a trend NASA published in the Astrophysical Journal Letters in September 2025

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In 2008, the Sun seemed to be fading into an unusually deep silence. Sunspots had become scarce. The solar wind, the stream of charged particles flowing away from the Sun, had weakened over roughly two decades. Several of its basic properties had fallen to levels not seen during the spacecraft era. For solar physicists, the [...] The post Scientists expected the sun to enter a period of historic quiet after 2008, when solar activity hit its weakest level on record — instead it reversed course entirely and has been growing more active ever since, in a trend NASA published in the Astrophysical Journal Letters in September 2025 appeared first on Space Daily .