UPDATE: Due to the Covid-19 pandemic, Cool Stars 21 was postponed to July 5 - 9, 2021! The "Cambridge Workshops of Cool Stars, Stellar Systems and the Sun" are held biennially and have evolved to be the premier conference series for cool star research. The next edition of the conference series "Cool Stars, Stellar Systems and the Sun" (CS 21) will be held in Toulouse from June 22 to 26, 2020 July 5 - 9, 2021, 40 years after its first edition in Cambridge (USA). This first edition was shortly followed that same year by a workshop on "Solar Phenomena ... Read more »