[onedoug]

Though the meteorite itself is much older. Ni/Fe can only be fused in environments ~2.5 billion degrees Kelvin, thus it must have come from an earlier star that went supernova.

[ETL]

Though the meteorite itself is much older. Ni/Fe can only be fused in environments ~2.5 billion degrees Kelvin, thus it must have come from an earlier star that went supernova.

Yes, except for the "~2.5 billion degrees Kelvin".

That then would mean it pre-dates the approximately 5 billion year-old solar system.

The Kelvin temperature scale begins at "absolute zero", or minus 273 Celsius. Water of course freezes at 0 deg Celsius.