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S c ia m . c o m argues that the moons lost energy to friction generated as they passed through the vastly extended atmospheres of the embryonic gas giant planets. Jupiter and Saturn, quite unlike Earth and other terrestrial planets, are composed primarily of hydrogen and helium. Most probably, they formed when a core of rock and ice, of roughly 10 Earth-masses, pulled in vast quantities of gas from the primordial disk surrounding the young sun. Before settling into their modern, relatively compact forms, the planets may have passed through a transient, distended phase, during which their atmospheres extended hundreds of times farther than they do now.
Which gives rise to new pseudogenes, is These observations indicate that very also frequently connected to changes in disparate events have led to independent an organism’s environment or its cir- bursts of retrotransposition that created cumstances. Consequently, differences pseudogenes in each of the lineages. THE AUTHORS ranging from bacteria to more complex organisms, such as yeast, worms, flies and mice, and their prevalence across a wide range of creatures is striking. The number of pseudogenes in different genomes varies greatly, more so than genes, and it is not readily predictable, because it is neither strictly proportional to the size of a genome nor to the total number of genes.
Another possibility emerges from a recent model in which the solar system remained choked with debris until some 700 million years after the planets formed. Strong gravitational interactions between Jupiter and Saturn then set up oscillations that shook the entire system. Billions of asteroids and comets were scattered as the major planets lurched into their present, more stable orbits. A tiny fraction of the scattered bodies could have been captured. In this scenario, proposed last year by K. Tsiganis and his colleagues of the Observatory of Côte d’Azur, most of the bodies shaken loose originally formed beyond Neptune in the Kuiper belt [see “The Kuiper Belt,” by Jane X.
[Magazine] Scientific American. Vol. 295. No 2
by Ronald
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