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.
Not exact matches
The gravitational forces of these spiral arms could scatter outward the problematic boulder - sized bodies, allowing them to accumulate rapidly to form
planetesimals large enough that gas drag is no longer a problem.
Planets and
planetesimals (small planets and
large asteroids) are formed primarily from silicate rocks and metal.
Oddly, the meteorites are magnetic, which is strange because the
planetesimals were supposed to be just
large agglomerations of rubble.
The Kuiper Belt hosts a swarm of distant, icy objects ranging in size from small, primordial
planetesimals to much
larger, highly evolved objects, representing a whole new class of previously unexplored cryogenic worlds.
None of the approximately 750,000 known asteroids and comets in the Solar System is thought to have originated outside it, despite models of the formation of planetary systems suggesting that orbital migration of giant planets ejects a
large fraction of the original
planetesimals into interstellar space1.
The team finds that including more realistic starting conditions (a
larger number of
planetesimals and
planetesimals with higher ice content) than usually assumed, red dwarf planets will not be dry.