The most widely accepted theory is that Mercury originally had a metal–silicate ratio similar to common chondrite meteorites, thought to be typical of the Solar System's rocky matter, and a mass approximately 2.25 times its current mass.
Den bredest accepterede teori er at Merkur oprindeligt havde et metal-silikat forhold der svarede til almindelige chondrit-meteoritter, der antages at være typiske for Solsystemets klippeholdige stof, og dens masse var omkring 2,25 gange dens nuværende masse.