How terrestrial planets were formed

[alokmohan]

A team of scientists from NASA's Johnson Space Center (JSC) and the Lunar and Planetary Institute (LPI), both in Houston, and the University of California, Davis (UCD) has found that terrestrial planets such as the Earth and Mars may have remained molten in their early histories for tens of millions of years. The findings indicate that the two planets cooled slower than scientists thought and a mechanism to keep the planet interiors warm is required. <br /><br />These new data reveal that the early histories of the inner planets in the solar system are complex and involve processes no longer observed. Evidence of these processes has been preserved in Mars, while it has been erased in Earth. So Mars is probably the best opportunity to understand how Earth formed. <br /><br />Vinciane Debaille (LPI), Alan Brandon (JSC), Qing-zhu Yin and Ben Jacobsen (UCD) present these new findings in a paper published in the Nov. 22 issue of Nature. <br /><br />Scientists think that early crust formation alone cannot account for the slow cooling magma ocean seen in large planets. This new evidence instead implies that Mars, at one time, had a primitive atmosphere that acted as the insulator. "The primitive atmosphere was composed mostly of hydrogen left over from accretion into a rocky planet, but was removed, probably by impacts, about 100 million years after the planet formed," said Debacle. <br /><br />Debaille and her colleagues performed precise measurements of neodymium isotope compositions of nine rare Martian meteorites called shergottites using mass spectrometers at JSC and UCD. Shergottites, named after the first-identified meteorite specimen that fell at Shergotty, India, in 1865, are a group of related meteorites from Mars composed primarily of pyroxene and feldspar. <br /><br />The scientists examined shergottites because their large range in chemical compositions is thought to be a fingerprint of the formation of their deep sources very early in the history of Mars. <br /><br />"Th

 

[alkalin]

The theory of expulsion of sun matter to form the planets should be reconsidered, since this would supply the original heat, and the fact that the planets lie in a close plane but not oriented to the suns axis is evidence that a large body passed by that caused enough of a convulsion of sun matter to form nearly all the planets.

 

[MeteorWayne]

This is a duplicate of the "Did Mars cool more slowly than thought" thread. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[alokmohan]

Suggest what is to be done.

 

[bguth]

What happens when something of a substantial rogue planet the size of Venus comes along?<br /><br />What happens when something icy and perhaps a little salty of 4000 km and roughly 8.5e22 kg smacks a glancing sucker punch of a nasty blow to Earth?<br /><br />Why are all the public super computers, along with their public owned physics software of 3D interactive orbital simulators. kept so unusually off-limits or otherwise taboo/nondisclosure rated? <br />-- Brad Guth

 

[nuaetius]

<blockquote><font class="small">In reply to:</font><hr /><p>What happens when something of a substantial rogue planet the size of Venus comes along? <p><hr /></p></p></blockquote><br /><br />We will all say “wow†as it floats through the solar system and completely misses us (We are increadibly small and I am sure it will miss us (Unless you want to start hitting planets with a sniper rifle)<br /><br /><blockquote><font class="small">In reply to:</font><hr /><p>What happens when something icy and perhaps a little salty of 4000 km and roughly 8.5e22 kg smacks a glancing sucker punch of a nasty blow to Earth? <p><hr /></p></p></blockquote><br /><br />We die. But unless something got dislodged from asteroid belts we have most things that scale that come anywhere near us tracked at this point.<br /><br /><blockquote><font class="small">In reply to:</font><hr /><p>Why are all the public super computers, along with their public owned physics software of 3D interactive orbital simulators. kept so unusually off-limits or otherwise taboo/nondisclosure rated?<p><hr /></p></p></blockquote><br /><br />Because someone’s department “paid†for it out of their budget and therefore are using those computers for the work/educational projects they got them to do. Or Bruce Willis is getting ready to go destroy an asteroid the size of Texas with the Air Force’s two spare titanium shuttles, and the governments don’t want us panicing…. never mind<br />

 

[bguth]

"Because someone’s department “paid†for it out of their budget and therefore are using those computers for the work/educational projects they got them to do. Or Bruce Willis is getting ready to go destroy an asteroid the size of Texas with the Air Force’s two spare titanium shuttles, and the governments don’t want us panicing…. never mind"<br /><br />But we paid for most all of those supercomputers, as well as for their spendy physics software, and usually for the facility building that it's within and in some instances we're even paying for the staff in charge of running it.<br /><br />Most such supercomputers are either fully public funded or at least more than half public funded, and they're not all nearly as occupied with official computing as we've been told.<br /><br />"the governments don’t want us panicing…. never mind"<br /><br />Instead of our knowing the best available whole truth and nothing but the truth, that statement of yours sounds a lot like those pesky Muslims having all of those WMD, and of our resident LLPOF warlord(GW Bush) saying "so what's the difference". <br />-- Brad Guth

 

[alokmohan]

What about Sanko Panza?Don quixote?