Proof of planetesimals for asteroid belt?

[zankaon]

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"

 

[Vanadium 50]

If asteroid belt objects are essentially of just iron,

Hmmm...I thought I answered this.

Most asteroid belt objects are not just iron. Only the M-types.

 

[qraal]

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"

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.