Fritz Zwicky

Fridolin 'Fritz' Zwicky (February 14, 1898 – February 8, 1974) was a Swiss astronomer and astrophysicist whose innovative theories fundamentally transformed our understanding of the universe. Born in Varna, Bulgaria to Swiss parents, Zwicky studied physics at the Swiss Federal Institute of Technology (ETH Zurich) and later became a faculty member at the California Institute of Technology, where he spent most of his distinguished career. In 1934, Zwicky and Walter Baade made the revolutionary discovery of supernovae and proposed the concept of 'neutron stars' as the remnants of stellar explosions—a theoretical prediction that was not observationally confirmed until 1968. His most profound contribution came in 1933 when he discovered evidence for what he termed 'dunkle Materie' (dark matter), through his analysis of the Coma Cluster's mass-to-light ratio, establishing that the universe contained vastly more matter than visible. Zwicky was also a prolific inventor and visionary thinker, patenting innovations in jet propulsion and proposing audacious ideas ranging from 'directed panspermia' to using nuclear explosions for space exploration. Though sometimes dismissed by contemporaries as unconventional, his prescient ideas were largely validated by later astronomical observations. Zwicky's legacy includes fundamental concepts that remain central to modern cosmology and astrophysics.