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Earth's Magnetic field

  1. Jan 29, 2016 #1
    Why only Earth has a magnetic field around it and not other planets?
  2. jcsd
  3. Jan 29, 2016 #2


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  4. Jan 29, 2016 #3
    and in the case of Jupiter the magnetic field is strong enough that it causes radio frequency emission which we can detect.
  5. Jan 29, 2016 #4
    And why do these planets show magnetism?
  6. Jan 29, 2016 #5


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    I'm sorry I don't understand your question. Are you asking why they have magnetic fields? As in, what generates the magnetic fields?
  7. Jan 30, 2016 #6


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    They have magnetic fields for the same or similar reasons that earth does

    Read those links that Drakkith gave you .... they give you your answers

  8. Jan 30, 2016 #7
    Earth is however the only one of the inner rocky planets which has a significant magnetic field.
    Mars seems to have remnants of a magnetic field in the past, but probably it doesn't have a liquid metal core any more.
    Mercury likely never had one for any length of time as it's very small.
    Venus though is anomalous, but then again it's anomalous in other ways, mainly in that it rotates 'backwards' around it's axis in relation to the other planets, (although that rotation is very slow.)
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