# 

Nom AnnĂ©e Pays Science 
RĂ©alisations 
381 

Joseph H. Taylor, Jr.
1941 USA Astronomie

codiscovered the first binary pulsar

382 

Russell Alan Hulse
1950 USA Astronomie

codiscovered the first binary pulsar

383 

Annie Jump Cannon
18631941 USA Astronomie

classified spectra of many thousands of stars; published catalogs of variable stars (including 300 she discovered)

384 

Henrietta Swan Levitt
18681921 USA Astronomie

discovered the periodluminosity relation for Cepheid variables

385 

Willem de Sitter
18721934 Les PaysBas Astronomie, Physique

studied the astronomical consequences of Einstein's theory of general relativity; deduced that a nearempty universe would expand





386 

Ejnar Hertzsprung
18731967 Le Danemark Astronomie

invented the colormagnitude diagram; by studying star clusters, independently discovered the relationship between absolute magnitude and spectral types of stars;

387 

Karl Schwarzchild
18731916 Allemagne Astronomie

first to give an exact solution of Einstein's equations of general relativity, giving an understanding of the geometry of space near a point mass; also made the first study of black holes

388 

Kiyotsugu Hirayama
18741943 Le Japon Astronomie

discovered the existence of groups of asteroids with similar orbital elements. He hypothesized that the asteroids in these families (now called Hirayama families) were physically related

389 

Vesto M. Slipher
18751969 USA Astronomie

first to measure the radial velocity of the Andromeda galaxy

390 

Walter Sydney Adams
18761956 USA Astronomie

identified Sirius B as the first white dwarf star known
