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a close-up of a spot on the Sun
NASA/SDO/AIA/HMI/Goddard Space Flight Center
Over the course of Feb. 19-20, 2013, scientists watched a giant sunspot form in under 48 hours. It grew to be over six Earth diameters across but its full extent is hard to judge since the spot lies on a sphere not a flat disk.

[Rerun] Old observations have an impact on the climate debate

Many years ago there was uncertainty about the extent to which sunspot activity had a decisive influence on climate change on the planet. Now, almost 250-year-old scientific observations from the Round Tower in Copenhagen, made by the unknown Danish Astronomer Christian Horrebow and his assistants, have finally shown it is not the case. Morten Remar has spoken with Associate Professor and Astronomer Christoffer Karoff from the Department of Geoscience at Aarhus University (in Danish).

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This podcast was produced with support from the Novo Nordisk Foundation.