What is the formation and evolution of the Solar System?
Formation and evolution of the Solar System. The formation and evolution of the Solar System began 4.5 billion years ago with the gravitational collapse of a small part of a giant molecular cloud.
Who proposed the nebular theory of Solar System formation?
The current standard theory for Solar System formation, the nebular hypothesis, has fallen into and out of favour since its formulation by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace in the 18th century.
When did the model of the Solar System change?
Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations. The Solar System has evolved considerably since its initial formation.
How do star systems form?
Studies continue to discover exactly how star systems form. A star system begins with a nebula – a cloud of gas and dust. This collapses around a central mass, which pulls the rest of the mass of the system around itself.
How did the inner Solar System become a protoplanet?
The interiors of these more mature bodies were becoming ordered — differentiated — into protoplanets. The process of collision and accretion continued until only four large bodies remained in the inner solar system — Mercury, Venus, Earth, and Mars, the terrestrial planets.
What is the process of accretion in the solar nebula?
Within the solar nebula, scientists believe that dust and ice particles embedded in the gas moved, occasionally colliding and clumping together. Through this process, called “accretion,” these microscopic particles formed larger bodies that eventually became planetesimals with sizes up to a few kilometers across.