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The first indication of the weakness of the magnetic field of Mars was obtained during the Mariner 4 spacecraft flyby in 1965. At a closest approach of 3.9 Mars radii, no indication of the Earth-like dipole magnetic field predicted by scaling arguments from theory was detected.
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www-ssc.igpp.ucla.edu/personnel/russell/papers/mars_mag...
www-ssc.igpp.ucla.edu/personnel/russell/papers/mars_mag/
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Mars Global Surveyor Magnetometer and Electron Reflectometer Science Team WWW site. ... to establish the nature of the magnetic field of Mars,
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Mars Global Surveyor Magnetometer and Electron Reflectometer Science Team WWW site. ... For the purposes of the Mars Global Surveyor, however, there is an even more important question: what is the nature of Mars' magnetic field?
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mgs-mager.gsfc.nasa.gov/Kids/magfield.html
mgs-mager.gsfc.nasa.gov/Kids/magfield.html
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The spacecraft's magnetometer, which began making measurements of Mars' magnetic field after its capture into orbit on Sept. 11, detected the magnetic field on Sept.
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www.spacedaily.com/mars/features/mgs-sci97a.html
www.spacedaily.com/mars/features/mgs-sci97a.html
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"It's likely that early on, traces of Mars' magnetic field were frozen in the planet's crust when its internal dynamo shut down. Later on, 'resurfacing' of the planet's northern hemisphere by some type of heating mechanism and large impact events in the southern hemisphere demagnetized much of the planet," he said.
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spaceflightnow.com/news/n0112/04marslumpy/
spaceflightnow.com/news/n0112/04marslumpy/
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Unlike modern Earth, Mars has almost no magnetic field today. Evidence has suggested Mars didn't have a very strong magnetic field early on, either. ... Each basin, carved out by a colossal space rock, is more than 3 billion years old. The data implied that Mars had a weak magnetic field back then.
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www.space.com/scienceastronomy/050511_magnetic_mars.htm...
www.space.com/scienceastronomy/050511_magnetic_mars.html
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What Happend to Mars' Magnetic Field? (theory that explains the history of mars and what happened to it's magnetic field that caused it's catastrophic decline and how earth is going through similar changes.) ... Did asteroids spark Mars' magnetic field? (msnbc.msn.com)
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reddit.com/info/l9kr/related
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A new study of Mars' ancient craters suggests giant asteroids may have been responsible for the extinction of the Red Planet's magnetic field. ... Nov. 19, 2008 -- Deep in Mars' past , an asteroid struck the planet with such titanic force that it could've killed off the planet's entire magnetic field, according to a new study.
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dsc.discovery.com/news/2008/11/19/mars-asteroid-magneti...
dsc.discovery.com/news/2008/11/19/mars-asteroid-magnetic.html
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Powerful appeal of Mars' 'missing' field. (magnetic field) ... find Science News articles. Powerful appeal of Mars' missing' field Planetary scientists disagree about whether Mars generates i... ... Planetary scientists disagree about whether Mars generates its own "intrinsic" magnetic field, as do Earth and most of...
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www.highbeam.com/doc/1G1-8811473.html?refid=ip_hf
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