Still in the Stone

DOM 08006. Antarctic. Carbonaceous.

Calcium-aluminium-rich inclusions — the oldest solids we have. First two hundred thousand to five hundred thousand years. Before Earth.

Five of them still hold a field. Ferromagnetic iron-nickel at the nanometre scale. A hundred and fifty to six hundred when the grains cooled through Curie. Earth today sits around thirty to sixty.

Until about twenty-ten people thought those inclusions carried no magnetic minerals. That first name did not stay.

Nebular magnetic field is looking if you stay with the number. Late mouth if you mean the whole story settled.

Simulations of the disc often leave magnetism out and crank gravity alone.

The leftover is both: the field still sitting in five inclusions from one stone, and the empty place in the models.