A meteoric cloud origin of the earth and the solar system was advocated by Darwin and Lockyer (mid 20th century), who thought of the existence of cloudy matter in form of bodies varying in size.
These were called meteoroids which constantly collided with each other to unite together under gravitational pull. This process continued to form lager unions, which became the centres of condensations to form planets and satellites.
According to Otto Schmidt (1943) in his meteoric hypothesis (also known as Interstellar Dust hypothesis) all planets including the earth were derived from some foggy matter occurring in the central part of our galaxy.
As the sun-a star moved very close to this centre of the galaxy, it attracted the foggy matter which was detached / thrown off in form of particles called meteoroids, which revolved round the sun. The meteoroids ultimately got together (united) to form bigger bodies which gave rise to planets and satellites. He postulated a cold origin of earth.