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REPORT ABUSIVE REPLY
Message Subject So what killed Mars Magnetfield ?
Poster Handle Bowyn Aerrow
Post Content
Mars is roughly 1/3rd the size of earth, and it doesn't have a large moon.

Earth is 'kneaded' by the moon orbiting it, the earth bulges toward the moon and away from the moon (tides). This affects not only the oceans, but the liquid center as well. All of this 'kneading' keeps the core hot.

Mars doesn't have a large moon to 'knead' its interior and keeping it hot.

Earth has more mass, the larger the body the longer it takes for it to cool off. Mars has cooled to the point where most likely its core is more solid, thus not reacting like a spinning sphere of molten metal, thus throwing off a magnetic field.

Earth is a younger planet, it has been suggested that there was a protoplasm collision (creating the moon) this reheated the earth and has lead to it being hotter now.

Spinning a liquid metal produces a magnetic field and one that switches often (magnet pole shift) and with 'ripples and eddies' much like the earths magnetic field.

Mars has a fossil field, one left in its rocks. Thus at one time it has a living core throwing off a magnetic field.
 Quoting: Bowyn Aerrow


So you are saying that the pull of the moon will make the core of the earth liquid ? You know the thing is the sun has higher forces on the earth why isn't it the earth then a whole liquid body ? with that much force the earth would heat itself from inside no greenhouse needed.
 Quoting: Anonymous Coward 27599911


The moon is closer to Earth than the sun thus has a larger tidal force on the Earth. Since the Earth spins at a far greater rate than the earth/moon orbit their barycenter, the tides moves across the surface of the earth. There is deformation of the solid land as there is of the water.

This is not enough to cause the core to turn to molten metal, but it is sufficient to nearly offset the general cooling.

If the moon was not there, then earth would be tide locked to the sun by now or close enough to where the core is not kneaded at a high enough rate to lead to maintaining the heat. Much like Venus which no longer has a liquid core, but one that has solidified.
 
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