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Proof of planetesimals for asteroid belt?

  1. Aug 3, 2009 #1
    If asteroid belt objects are in part iron, is this then consistent with such differentiated pieces being solidified remains of a liquid core(s) of previous colliding planetesimals?

    p.s. total mass of asteroid belt may be just 4% of moon. http://en.wikipedia.org/wiki/Asteroid_belt" [Broken]
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Aug 3, 2009 #2

    Vanadium 50

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    Hmmm...I thought I answered this.

    Most asteroid belt objects are not just iron. Only the M-types.
     
  4. Aug 5, 2009 #3
    Simply put, yes. More correctly the metallic meteorites are evidence of a parent body which had differentiated into metals in the core and silicates floating on top to make the crust. This was only possible while extensive amounts of Aluminium-26 was available to create sufficient heat from its radioactive decay. As Al-26 had a half-life of less than ~0.8 million years that means the parent bodies of the metallic meteoroids formed within a few million years of the formation of the Solar system.
     
    Last edited by a moderator: May 4, 2017
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