(1897–1963), Russian-born American astronomer. He was mainly interested in spectroscopic investigations into the composition, evolution, and rotation of stars, but his most important contribution was his discovery of the presence of ionized hydrogen in interstellar space (1938).
Definition of Struve, Otto in US English:
Struve, Otto
proper nounˈSHtro͞ovə
(1897–1963), US astronomer, born in Russia. In 1938, he discovered the presence of ionized hydrogen in interstellar space.