Hello,

According to my current knowledge, the earth's magnetic field formed
due to the molten iron core that is spinning to create a magnetic
field. This magnetic field is also what is protecting us from harmful
bursts (solar plasma?) from the sun.

I don't understand one thing - why doesn't Mars have one?

rAgAv <ragav.payne@googlemail.com> wrote in news:1ffef2dc-a033-410e-96f4-
4f0136740470@e6g2000prf.googlegroups.com:

Hello,

According to my current knowledge, the earth's magnetic field formed
due to the molten iron core that is spinning to create a magnetic
field. This magnetic field is also what is protecting us from harmful
bursts (solar plasma?) from the sun.

I don't understand one thing - why doesn't Mars have one?

Mars is cold. Being smaller, it cooled quicker. It's liquid
core froze eons ago thus shutting down its dynamo.

Mars is cold. Being smaller, it cooled quicker. It's liquid
core froze eons ago thus shutting down its dynamo.

Earth faces the same fate.

But then why does Venus not have one? Being roughly the same size as Earth
and all................

"Timberwoof" <timberwoof.s...@inferNOnoSPAMsoft.com> wrote in message

news:timberwoof.spam-30CDC8.09083319032008@nnrp-virt.nntp.sonic.net...



In article <gfWdnSyiUOCYYn3anZ2dnUVZ_u6rn...@comcast.com>,
John Popelish <jpopel...@rica.net> wrote:
Why would that event suddenly leave the iron core in the
Earth and not leave one in the moon?

Because it had greater momentum and was less likely to vapourise.
cheers
Bill

Landy wrote:

But then why does Venus not have one? Being roughly the same size as Earth
and all................

Perhaps the impact that created the Moon added the iron core
of the impactor to Earth's core, causing it to be over an
sized core (relative to Mars and Venus, and especially to
the Moon, which has little), and also reheated the whole
interior, causing it to still be warmer, today, than it
otherwise would have been.

Skywise <into@oblivion.nothing.com> wrote:

Mars is cold. Being smaller, it cooled quicker. It's liquid
core froze eons ago thus shutting down its dynamo.

Earth faces the same fate.

No so sure. Mars has an important volcanic activity which is at odd with
the hypothesis that it is a dead cold planet:

http://www.esa.int/esaCP/SEMCPLM5NDF_index_0.html

--
Florian
"Toute vérité passe par trois phases. D'abord, elle est ridiculisée;
ensuite, elle rencontre une vive opposition avant d'être acceptée comme
une totale évidence" - Arthur Schopenhauer
- - - - -<> <> - - - - -

It had volcanic activity up to 100 million years ago. It has none, now,
today, this minute, and is therefore presumed deceased.

"Florian" <auxotectonics_deletethis@nachon_andthis.net> wrote in message
news:1ie1tyx.kov73012akbdoN%auxotectonics_deletethis@nachon_andthis.net...
Skywise <into@oblivion.nothing.com> wrote:

Mars is cold. Being smaller, it cooled quicker. It's liquid
core froze eons ago thus shutting down its dynamo.

Earth faces the same fate.

No so sure. Mars has an important volcanic activity which is at odd with
the hypothesis that it is a dead cold planet:

http://www.esa.int/esaCP/SEMCPLM5NDF_index_0.html

--
Florian
"Toute vérité passe par trois phases. D'abord, elle est ridiculisée;
ensuite, elle rencontre une vive opposition avant d'être acceptée comme
une totale évidence" - Arthur Schopenhauer
- - - - -<> <> - - - - -
It had volcanic activity up to 100 million years ago.

In article <gfWdnSyiUOCYYn3anZ2dnUVZ_u6rnZ2d@comcast.com>,
John Popelish <jpopelish@rica.net> wrote:

Landy wrote:

But then why does Venus not have one? Being roughly the same size as
Earth
and all................

Perhaps the impact that created the Moon added the iron core
of the impactor to Earth's core, causing it to be over an
sized core (relative to Mars and Venus, and especially to
the Moon, which has little), and also reheated the whole
interior, causing it to still be warmer, today, than it
otherwise would have been.

Not likely. The impactor, and thus its dense iron core, had a velocity
that took it away from the Earth again (albeit probably in lots of
little pieces). Why would that event suddenly leave the iron core in the
Earth and not leave one in the moon?

According to a documentary that I watched, when earth was still in its
molten state, the heavy iron present in the spinning planet moved into
the center because of its heaviness and all the lighter substances
moved to the crust thus giving rise to the spinning iron core of the
earth. This spinning iron core gives rise to the magnetosphere.

So, just because Mars was a little bit smaller and was farther from
the sun, it cooled away faster thus leaving the process of formation
of the core at an immature status?

hmm...does Mars even have Iron in its composition? Anyway, where did
the iron in Earth come from?

Not likely. The impactor, and thus its dense iron core, had a velocity
that took it away from the Earth again (albeit probably in lots of
little pieces).

SBC Yahoo <atilla.the.hun@liberals.suck.net> wrote:

It had volcanic activity up to 100 million years ago. It has none, now,
today, this minute, and is therefore presumed deceased.

Do you seriously consider that the activity is now dead forever? That
would be ludicrous.