United States astronomer who discovered that (as the universe expands) the speed with which nebulae recede increases with their distance from the observer (1889-1953)
astrophysicist 1
noundomain: person
Princeton WordNet [ver.3.1]
English
Definition
an astronomer who studies the physical properties of celestial bodies
United States astronomer who discovered that (as the universe expands) the speed with which nebulae recede increases with their distance from the observer (1889-1953)