In the cooler outer regions of this disk, dust grains collided and stuck together, eventually growing into planetesimals and then full planets. Old Theories: Catastrophic Encounters
The most widely accepted model, the , was first proposed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. It suggests our solar system formed from a massive, rotating cloud of interstellar gas and dust—the solar nebula—that collapsed under its own gravity. The Formation of the Solar System: Theories Old...
The Formation of the Solar System: Theories Old and New For centuries, humanity has looked at the stars and wondered: how did this all begin? Our current understanding of the solar system’s birth 4.6 billion years ago is a blend of centuries-old logic and cutting-edge space observations. The Foundation: The Nebular Hypothesis In the cooler outer regions of this disk,