This finding was expected because meteorites from Vesta have less iron than the solar nebula from
which planetary building blocks formed.
Not exact matches
Then, the team used a computer program to test different compositions of basic
planetary building blocks to determine
which makeups would yield planets with those densities.
Planets have churned and reprocessed that original material, but the unused bits became asteroids and comets,
which are essentially pristine
planetary building blocks.