Posted on 12/12/2017 10:53:55 AM PST by BenLurkin
According to a new study conducted by an international team of scientists, it may have something to do with a massive impact that occurred in the past. Since Venus appears to have never suffered such an impact, its never developed the dynamo needed to generate a magnetic field.
...
According to the most widely-accepted models of planet formation, terrestrial planets are not formed in a single stage, but from a series of accretion events characterized by collisions with planetesimals and planetary embryos most of which have cores of their own.
Recent studies on high-pressure mineral physics and on orbital dynamics have also indicated that planetary cores develop a stratified structure as they accrete. The reason for this has to do with how a higher abundance of light elements are incorporated in with liquid metal during the process, which would then sink to form the core of the planet as temperatures and pressure increased.
Such a stratified core would be incapable of convection, which is believed to be what allows for Earths magnetic field. Whats more, such models are incompatible with seismological studies that indicate that Earths core consists mostly of iron and nickel, while approximately 10% of its weight is made up of light elements such as silicon, oxygen, sulfur, and others. Its outer core is similarly homogeneous, and composed of much the same elements.
To add to this state of confusion, paleomagnetic studies have been conducted that indicate that Earths magnetic field has existed for at least 4.2 billion years (roughly 340 million years after it formed). As such, the question naturally arises as to what could account for the current state of convection and how it came about.
(Excerpt) Read more at universetoday.com ...
Two seconds apart with Velikovsky...
8^)
Or for anything?
Terran privilege, of course. Earth-like planets have always exercised hegemony over Venus. #VenusMagnetosphereMatters
You guys are making this WAY too hard. God just MADE it that way! Imagine puny minds trying to reach the furthest reaches of the unsearchable, omniscient, infinite, eternal mind of “I AM”.
Rare Earth.
We may be on the only habitable planet in the Universe.
Another variable added to the mix. A human habitable planet, MUST be collided with a large sub body, of the precise elemental content.
Rock + Iron = Habitable = Earth
Gee, what a stumper. It's almost as if they had different origins. :') Thanks BenLurkin .
|
Just how do you know all those assumptions of yours are correct when no astronomer knows? There could be many ways a planet could form without collisions and still have a nickle-iron core. Who said Drake was correct? They are just theories which are constantly evolving or otherwise changing, there are no absolutes, just guesses.
20 years ago you would have been laughed at to suggest in two decades hundreds of solar systems would be found with planets.
Yeah - amazing minds and all that. I didn’t want to go too far here with that, as half the people here would be very cross with me for suggesting anything outside of the ‘accepted’ status quo, or allow any new ideas to enter (even if the new ideas are 65 years old).
History, like climate change and science, is settled and fixed. Don’t even try to argue different. /s
Couldn’t afford that option as it only available on the XLT model.
Because Venus doesn’t have Chuck Norris.
Venus was a woman.
Women don’t have magnetospears
...or any other kind of spear
A goddess on a mountain top
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.