Together with Otto Struve, he studied the rapid rotation of stars of young spectral types and measured the radial velocities of stars.
Roman Abramovich | Grigory Zinoviev | Grigory Shelikhov | Grigory Yavlinsky | Grigory Potemkin | Grigory Levenfish | Vsevolod Abramovich | "''The Alexander Column in scaffolds''" (1832-1834), by Grigory Gagarin | Mikhail Abramovich Popov | Grigory Zinoviev's | Grigory Valuyev | Grigory Semyonov | Grigory Romodanovsky | Grigory Pomerants | Grigory Ostrovsky | Grigory Landsberg | Grigory Laguta | Grigory Kramarov | Grigory Kheifets | Grigory Gurevich | Grigory Gamarnik | Grigory Drozd | ''Gondola Races on the Grand Canal of Venice'', by Grigory Gagarin |