SOLAR SYSTEM

Detailed explanation-1: -Accretion is the process where small particles of dust, gas, and ice collect and stick together gradually. Gravity attracts these particles together, and they continue to accumulate to form a larger mass.

Detailed explanation-2: -Accretion is the process in which material from the outer plate and trench (during the periods of discontinuous subduction) is removed and added to the outer continental margin or by other mechanisms such as imbricate thrusting or a combination of folding and thrusting (Karig, 1974; Karig and Sherman, 1975).

Detailed explanation-3: -Definition of planetesimal While the name is always applied to small bodies during the process of planet formation, some scientists also use the term planetesimal as a general term to refer to many small Solar System bodies – such as asteroids and comets – which are left over from the formation process.

Detailed explanation-4: -In this context, accretion refers to the process of cooled, solidified grains of dust and ice orbiting the protostar in the protoplanetary disk, colliding and sticking together and gradually growing, up to and including the high-energy collisions between sizable planetesimals.

Detailed explanation-5: -Accretion is the inevitable result of gravitational forces operating on all scales, and on all types of material-gas, dust, plasma, even dark matter. Gravity makes matter accrete. And when matter accretes, it forms objects.