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Astronomers are using tree rings as a historical record of solar activity and they've found that the Sun was much more active in the past. Our Sun is not the faithfully constant light source it appears to be. Solar activity varies in a fairly. ....
| UPDATED: 15:14, Thu, Jan 28, 2021 Link copied Sign up for FREE for the biggest new releases, reviews and tech hacks SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they ll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. 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. ....
Researchers have reconstructed solar activity back to the year 969 using measurements of radioactive carbon in tree rings. Those results help scientists better understand the dynamics of the sun and allow more precise dating of organic materials using the C14 method. What goes on in the sun can only be observed indirectly. Sunspots, for instance, reveal the degree of solar activity the more sunspots are visible on the surface of the sun, the more active is our central star deep inside. Even though sunspots have been known since antiquity, they have only been documented in detail since the invention of the telescope around 400 years ago. We also now know that the number of spots varies in regular eleven-year cycles and that, there are long-lasting periods of strong and weak solar activity, which is also reflected in the climate on Earth. ....