Jacobus Kapteyn
Prof Jacobus Cornelius Kapteyn FRS FRSE LLD was a Dutch astronomer. He carried out extensive studies of the Milky Way and was the discoverer of evidence for galactic rotation. Kapteyn was also among the first to suggest the existence of dark matter using stellar velocities as early as 1922.
From *.wikipedia.org,
General Info
.
Male
Date of Death
June 18th, 1922
Died Aged
-47
Star Sign
Capricorn
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