EVERYDAY SCIENCE

Detailed explanation-1: -The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems).

Detailed explanation-2: -The most widely accepted model of planetary formation is known as the nebular hypothesis. This model posits that, 4.6 billion years ago, the Solar System was formed by the gravitational collapse of a giant molecular cloud spanning several light-years.

Detailed explanation-3: -The formation of celestial bodies, stars, planets, asteroids, satellites, and comets is one of the major problems in astrophysics. It is generally agreed that at least the stars and the comets are formed by condensation of interstellar matter.

Detailed explanation-4: -geocentric model, any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all. The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century ce).

Detailed explanation-5: -The Accretion theory The Sun passes through a dense interstellar cloud and emerges surrounded by a dusty, gaseous envelope. The problem is that of getting the cloud to form the planets. The terrestrial planets can form in a reasonable time, but the gaseous planets take far too long to form.