cosmogony: Related Content
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string theoryplanetesimalsolar nebulaproto-Moonproto-Earthcollision theoryaccretioncoaccretion hypothesisfission hypothesisgiant-impact hypothesiscosmologycelestial mechanicsradio and radar astronomyinfrared astronomyastrobiologymeteoriticsultraviolet astronomyastrophysicsspace explorationsolar system
Key People

Pherecydes of Syros
Greek writer

William Herschel
British-German astronomer

Harold C. Urey
American chemist

Gerard Peter Kuiper
American astronomer

Sir Harold Jeffreys
British astronomer and geophysicist

Ernst Öpik
Estonian astronomer

Sir George Darwin
British astronomer

Immanuel Velikovsky
American writer
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