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Ars Technica - ScienceEnglish · 8 months ago

How Kepler’s 400-year-old sunspot sketches helped solve a modern mystery

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How Kepler’s 400-year-old sunspot sketches helped solve a modern mystery

arstechnica.com

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Ars Technica - ScienceEnglish · 8 months ago

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A sharp decline in sunspot activity in the 17th century has long puzzled astronomers.

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