2 Hryvni Serhiy Vsehsvyatskyi

Serhiy Vsehsvyatskyi was a Soviet-Ukrainian astronomer who spent decades at the Kyiv Observatory cataloguing solar activity and developing what became known as the Vsehsvyatskyi hypothesis — a controversial theory that comets originate from volcanic ejections on the giant planets rather than from a distant primordial cloud. The mainstream rejected it, but it kept serious attention through the mid-20th century. This 2 hryvni commemorative was issued as part of Ukraine's long-running series honoring figures in science and culture, a program that accelerated sharply after independence as a deliberate project of national intellectual reclamation.