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6 March 2014 1:04 pm ,
Vol. 343 ,
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
- 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).]