Assertion: asteroid belt's asteroid | /r/HasProperty | planetesimal
Facets:
Source sentences:
text: Scientists now believe that asteroids are planetesimals—ancient chunks of matter left over from the formation of the solar system that never came together to form a planet, perhaps because of the strong gravitational influence of Jupiter.
text: Current theory suggests that asteroids are planetesimals - the building blocks of planets - that were never incorporated into one of the eight planets in our solar system.
text: Unfortunately, 4.5 billion years of collisions have broken up several original asteroids (the planetesimals) and produced generations of younger asteroid fragments, so the original size distribution can no longer be distinguished from that produced by collisions (7).