The Formation Of The Solar System: Theories Old... Apr 2026

Before the Nebular Hypothesis became the standard, other "catastrophic" theories were popular: History of Solar System formation and evolution hypotheses

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...

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 Before the Nebular Hypothesis became the standard, other