Jaan Einasto Jaan Einasto is an Estonian astrophysicist. is one of the discoverers of the large-scale structure of the Universe. He was Head of the Division of Astronomy and Physics of the Estonian Academy of Sciences in Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). . Einasto is a member of the Academia Europaea, the European Astronomical Society, and the Royal Astronomical Society.