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#: 401 - 410

# Namn
år
Land
Vetenskap
Vinningar
401 Fritz_Zwicky_1683.jpg
Fritz Zwicky

1898-1974
Schweiz
Astronomi

observed Coma cluster of galaxies and determined that most of the cluster must be ``dark matter''; proposed existence of dwarf galaxies; proposed existence of supernovas and that their collapse might lead to neutron stars;
402 Jan_Hendrik_Oort_1684.jpg
Jan Hendrik Oort

1900-1992
Nederländerna
Astronomi

calculated distance to center of galaxy; determined period for sun to complete one revolution of Milky Way; calculated the mass of the Milky Way;
403 Cecelia_Payne-Gaposchkin_1685.jpg
Cecelia Payne-Gaposchkin

1900-1979
Storbritannien
Astronomi

discovered that stars are composed primarily of hydrogren, with helium the second-most abundant element
404 George_Gamow_1686.jpg
George Gamow

1904-1968
Ryssland
Astronomi, Fysik

first suggested hydrogen fusion as source of solar energy
405 Karl_G._Jansky_1687.jpg
Karl G. Jansky

1905-1950
USA
Astronomi

discovered radio waves from space, thereby pioneering the birth of radio astronomy
406 Gerard_P._Kuiper_1688.jpg
Gerard P. Kuiper

1905-1973
Nederländerna
Astronomi

discovered Miranda, the fifth satellite of Uranus; discovered Nereid, the second satellite of Neptune; discovered the atmosphere of Titan, Saturn's largest satellite
407 Bruno_B._Rossi_1689.jpg
Bruno B. Rossi

1905-1993
Italien
Astronomi

pioneer of x-ray astronomy and space plasma physics; participated in discovery of the first known x-ray source outside the solar system (Scorpius X-1)
408 Bart_Jan_Bok_1690.jpg
Bart Jan Bok

1906-1983
Nederländerna
Astronomi

suggested that small dark globules of interstellar gas and dusk (now called Bok globules) are collapsing to form new stars
409 Clyde_Tombaugh_1691.jpg
Clyde Tombaugh

1906-1997
USA
Astronomi

discovered the planet Pluto
410 Fred_Whipple_1692.jpg
Fred Whipple

1906-2004
USA
Astronomi

proposed the ``dirty snowball'' model of cometary structure

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