In addition to rocky asteroids and icier bodies further out from the Sun, many
agglomerated into larger
planetesimals that eventually collided to form planets like the Earth, and more than 250 minerals, including olivine and zircon, developed within the
planetesimals with the help of melting, collisional shocks, and reactions with water.
It is likely that any protoplanetary bodies that may have formed around S2 are still
agglomerating other
planetesimals, or have been lost to interstellar space or the black hole from gravitational perturbations.