What were the kilometer-sized objects that acted as the primary builders of the major planets?
Answer
Planetesimals
Planetesimals were kilometer-sized objects formed from the aggregation of smaller clumps; their continued high-velocity collisions led to the formation of protoplanets.
#Videos
Formation of the Solar System - The Solar Nebula theory Explained
Related Questions
What is the leading scientific explanation for the formation of our solar system architecture?Approximately how long ago did the Sun and planets begin coalescing from the solar nebula?What two elements made up roughly 98% of the mass in the original solar nebula?What event is cited as the most common mechanism for disturbing the nebula's equilibrium and initiating gravitational collapse?Which physical principle caused the cloud to spin faster as it contracted, leading to its flattening?What is the term for the vast, thin, spinning structure that the spherical nebula transformed into?What was the dense, hot concentration of matter at the center of the disk called before nuclear fusion ignited?What is the process through which microscopic dust grains in the disk built up into larger bodies?What were the kilometer-sized objects that acted as the primary builders of the major planets?What phenomenon causes the inner terrestrial planets to be composed mainly of rock and metal?What compositional feature defines the region where temperatures were low enough for water, methane, and ammonia to condense into solids?