Evolution: A Scientific American ReaderScientific American University of Chicago Press, 2008 M09 15 - 312 páginas From the Scopes “Monkey Trial” of 1925 to the court ruling against the Dover Area School Board’s proposed intelligent design curriculum in 2005, few scientific topics have engendered as much controversy—or grabbed as many headlines—as evolution. And since the debate shows no signs of abating, there is perhaps no better time to step back and ask: What is evolution? Defined as the gradual process by which something changes into a different and usually more complex and efficient form, evolution explains the formation of the universe, the nature of viruses, and the emergence of humans. A first-rate summary of the actual science of evolution, this Scientific American reader is a timely collection that gives readers an opportunity to consider evolution’s impact in various settings. |
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... temperature in the densest parts would drop to about 200 to 300 kelvins, reducing the gas pressure in these regions and hence allowing them to contract into gravitationally bound clumps. This cooling plays an essential role in allowing ...
... most stars currently form . Dust grains and molecules containing heavy elements cool the present - day clouds much more efficiently to temperatures of only about 10 kelvins . The minimum mass. THE FIRST STARS IN THE UNIVERSE 17.
... temperature and inversely proportional to the square root of the gas pressure. The first star-forming systems would have had pressures similar to those of present- day molecular clouds. But because the temperatures of the first ...
... TEMPERATURE : 100,000 to 110,000 kelvins LIFETIME : 3 million years Different groups have arrived at somewhat ... temperatures than stars with compositions like that of the sun . The pro- duction of nuclear energy at the center of a star ...
... temperatures of about 100,000 kelvins— about 17 times higher than the sun's surface temperature. Therefore, the first starlight in the universe would have been mainly ultraviolet radia- tion from very hot stars, and it would have begun ...
Contenido
Cellular Evolution | 85 |
Dinosaurs and Other Monsters | 169 |
Human Evolution | 249 |
Contents | 362 |
Illustration Credits | 364 |
The Evolution of the Universe | 1 |
Cellular Evolution | 85 |
Dinosaurs and Other Monsters | 169 |
Human Evolution | 249 |