High Quality Content by WIKIPEDIA articles! Ernst Julius Opik (23 October 1893 – 10 September 1985) was a notable Estonian astronomer and astrophysicist, who spent the second half of his career (1948–1981) at the Armagh Observatory in Northern Ireland. Opik was born in Kunda, Estonia. He went to University of Moscow to specialize in the study of minor bodies, such as asteroids, comets, and meteors. He completed his doctorate at theUniversity of Tartu. In 1916 Opik published article in Astrophysical Journal where he estimates the densities of visual binary stars. It is interesting to note that in his sample was 2 Eridani, a white dwarf star. Opik determined its density as 25000 times the density of the Sun but concluded that the result is impossible.

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