What is the Planetissimal Theory?

Answer 1

The Planetissimal Theory agrees with the Solar Disruption Theory. Because of the near collision of the Sun and another star, the Sun blew out some hot materials. These hot materials became parts of the star passing near the Sun. The Sun continued to blow large and small particles which became the planets, meteorites and other heavenly bodies.

---- Source: The World: History and Civilization

Answer 2

The planetesimal theory suggests that planets form from the collision and accumulation of small objects called planetesimals in the early solar system. These planetesimals are essentially building blocks that eventually come together to form planets through gravitational attraction and collisions. This theory helps explain how planets like Earth formed from the debris left over after the formation of the Sun.

Answer 3

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Answer 4

A widely accepted theory of planet formation, the so-called planetesimal hypothesis of Viktor Safronov, states that planets form out of dust grains that collide and stick to form larger and larger bodies. When the bodies reach sizes of approximately one kilometer, then they can attract each other directly through their mutual gravity, aiding further growth into moon-sized protoplanets enormously. This is how planetesimals are often defined. Bodies that are smaller than planetesimals must rely on brownian motion or turbulent motions in the gas to cause the collisions that can lead to sticking. Alternatively, planetesimals can form in a very dense layer of dust grains that undergoes a collective gravitational instability in the mid-plane of a protoplanetary disk. Many planetesimals may eventually break apart during violent collisions, but a few of the largest planetesimals can survive such encounters and continue to grow into protoplanets and later planets.

Answer 5

The theory of planetisimal is the widely accepted theory of planet formation. This states that planets form out of cosmic dust grains.