Sole senza macchie: l’anno più vuoto dell’era spaziale

Spotless Sun: Blankest Year of the Space Age As of Sept. 27, 2008, the sun had been blank, i.e., had no visible sunspots, on 200 days of the year. To find a year with more blank suns, you have to go back to 1954, three years before the launch of Sputnik, when the sun [...]