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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- About Us
Early Planet Theory: Not Standing on Solid Ground
29 April 1998 6:00 pm
Forest Ray Moulton, an American astronomer known for a dominant early theory on how planets form, was born on this day in 1872. Moulton and Thomas Chrowder Chamberlin proposed in 1904 that the solar system formed after gas flares were ripped from the sun by the gravitational field of a passing star. The flares then condensed into "planetesimals" arrayed in a spiral extending from the sun; these planetesimals, the duo suggested, gradually accumulated material and became the planets we know today. Although it is now believed that gas ejected from the sun will not condense into solids, Moulton and Chamberlin's idea of a spiral galaxy influenced later astronomical observations, such as those of the rotating Andromeda galaxy.
[Source: Emily McMurray, Ed., Notable Twentieth Century Scientists (Gale Research Inc., ITP, 1995).]