Steps in the accretion process:

The order of the planets in the solar system, starting nearest the sun and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and then the possible Planet Nine. If you insist on including Pluto, it would come after Neptune on the list.

Two processes are important in planet formation. Condensation is the production of solid dust grains as gases in the molecular cloud cool, and accretion is the collision of the dust grains to form clumps and progressively larger bodies, some of which grow into planets (Figure 10.2).

• Step 1: accretion of cm sized particles.
• Step 2: Physical Collision on km scale.
• Step 3: Gravitational accretion on 10-100 km scale.
• Step 4: Molten protoplanet from the heat of accretion.
• Final step is differentiation of the earth: Light objects float; heavy objects sink.

What was the primary role of dust in the formation of the solar system? Dust acted as condensation nuclei; platforms to which other particles could attach and form larger particles of matter. spins faster due to conservation of angular momentum. faster due to conservation of angular momentum.

What is the role of irregularities in the solar system in terms of theories of its origin? They introduce a need for flexibility in theories of the solar system’s origin. C) Theories of the solar system are entirely based on the many irregularities found among the planets and moons.

The Kuiper Belt is a doughnut-shaped ring of icy objects around the Sun, extending just beyond the orbit of Neptune from about 30 to 55 AU.

Nebular Theory

noun, plural the·o·ries. a body of principles, theorems, or the like, belonging to one subject: number theory. a particular conception or view of something to be done or of the method of doing it; a system of rules or principles: conflicting theories of how children best learn to read.