Earth and Venus are the Same Size, so Why Doesn’t Venus Have a Magnetosphere?....

universetoday.com ^ | universetoday.com | Matt Williams

[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 Earth’s magnetic field. What’s more, such models are incompatible with seismological studies that indicate that Earth’s 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. It’s 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 Earth’s 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.

[BenLurkin]

FULL TITLE: Earth and Venus are the Same Size, so Why Doesn’t Venus Have a Magnetosphere? Maybe it Didn’t Get Smashed Hard Enough

[NohSpinZone]

The global warming nutjobs often use Venus as the model for the catastrophic effects of runaway global warming. As if they’ve been there and understand how Venus got to be as hot as it is.

[brownsfan]

The full title is very amusing.

[Jeff Chandler]

Men are from Mars, Women are from Venus. Let’s get liquored up and go to Venus.

[z3n]

"Maybe it Didn’t Get Smashed Hard Enough"

[null and void]

We’re told the earth’s atmosphere would be stripped away by the solar wind if the earth’s magnetosphere did not shield it.

Yet Venus, being closer to the sun, has a more intense solar wind flux, no protective magnetosphere, and a very thick atmosphere.

What’s up with that???

[z3n]

NohSpinZone wrote:

The global warming nutjobs often use Venus as the model for the catastrophic effects of runaway global warming. As if they’ve been there and understand how Venus got to be as hot as it is.

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The goldilox zone can be very narrow.... but I’m sure that has nothing to do with it. It’s all the smoke stacks those venusians had. Quade, start the reactor. D’oh!

[ClearCase_guy]

Does Hillary have a magnetosphere? I’m pretty sure she’s been smashed hard enough.

[Red Badger]

No iron, no magnetism........................

[SkyDancer]

It’s hotter on Venus than Mercury which is closer to the Sun.

[Dr. Sivana]

We'll be fine visiting, if we brush up on our Hungarian!

[Red Badger]

No SUV’s......................

[DannyTN]

Good question.

[DannyTN]

LOL

[Maceman]

Men are from Mars, Women are from Venus. Let’s get liquored up and go to Venus.

"Oh sure. Give US the one with all the monsters." -- Homer Simpson

[Seruzawa]

They talk out of their rectums. For an interesting take search “electrical universe”.

[Conan the Librarian]

That was the Pot-addled mind of Carl Sagan at work to come up with that line of reasoning.

[LouieFisk]

“It’s all the smoke stacks those venusians had.”
—
Don’t be silly, everyone knows it was their SUVs and Venusian- cow flatulence.

[MMaschin]

The Earth has an iron core that is about 1.5X larger than it should be. The theory is that the Earth was impacted by a Mars sized object. The iron cores combined, but other material ejected, and formed the Moon.

Without this impact, we would not have the strong magnetosphere, to protect us, nor would we have the Moon that stabilizes the Earth's rotation. The Earth would be a very chaotic place, and it's likely life would not have evolved past a biologic sludge.

That is why I find it ridiculous that people keep calling exoplanets, 'Earth-like', because they are not. In order for a planet to be truly 'Earth-like', it MUST have what the Earth received in the massive collision that created the Moon. And if you calculate the odds of that, it makes the Earth a MUCH rarer commodity.

[BenLurkin]

bttt