Jennifer Ouellette on Nostr: How Kepler’s 400-year-old sunspot sketches helped solve a modern mystery. A sharp ...
Published at
2024-07-31 21:17:14Event JSON
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"content": "How Kepler’s 400-year-old sunspot sketches helped solve a modern mystery. A sharp decline in sunspot activity in the 17th century has long puzzled astronomers. https://arstechnica.com/science/2024/07/how-keplers-400-year-old-sunspot-sketches-helped-solve-a-modern-mystery/",
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