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| UPDATED: 15:14, Thu, Jan 28, 2021
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The Sun has long been recognised to experience different periods of solar activity. Galileo first pointed a telescope at the sun in 1612, and astronomers have since observed and recorded the coming and going of sunspots.
Reconstruyen milenio de actividad solar gracias a anillos de árboles milenio.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from milenio.com Daily Mail and Mail on Sunday newspapers.
An international team of researchers led by ETH Zurich has reconstructed solar activity back to the year 969 using measurements of radioactive carbon in.