Victor Ambartsumian

Victor Amazaspovich Ambartsumian was an Armenian astronomer and astrophysicist celebrated as one of the founders of theoretical astrophysics in the Soviet Union. A graduate of Leningrad State University, Ambartsumian founded the prestigious Byurakan Astrophysical Observatory in Armenia in 1946 atop the slopes of Mount Aragats, and served as President of the Armenian Academy of Sciences for over four decades.

In 1947, Ambartsumian made the revolutionary discovery of stellar associations—loose groupings of young, hot O and B type stars that are dynamically expanding. He proved that star formation is not a relic of the ancient universe, but an ongoing process occurring in our galaxy today. In the 1950s, he introduced the concept of active galactic nuclei (AGN), demonstrating that supermassive energetic processes in galaxy cores involve explosive ejections of matter rather than gradual condensation. He served as president of the International Astronomical Union (IAU) from 1961 to 1964.