NASA: Are Sunspots Disappearing? — ‘Could completely vanish around the year 2015’
'It wouldn't be first time. In 17th century, the sun plunged into a 70-year period of spotlessness known as Maunder Minimum'
'It wouldn't be first time. In 17th century, the sun plunged into a 70-year period of spotlessness known as Maunder Minimum'
