Question

what happens in the process of gravitational condensation?
an object decreases in size due to the collision of materials.
an object increases in size due to the addition of materials.
gas particles are formed from solar nebula materials.
solid particles are formed from solar nebula materials.

Explanation:

Gravitational condensation is the process where an object (like a planetesimal, planet, etc.) grows in size. This occurs as it attracts and accumulates (adds) more materials (such as dust, gas - in some cases, but mainly solid - like materials in the context of planet formation) through gravitational forces.

• Option 1: An object decreasing in size due to material collision is incorrect. Collisions in the context of gravitational condensation are more about sticking together (accretion) rather than causing a size decrease.
• Option 3: Gas particles forming from solar nebula materials is not the main essence of gravitational condensation. Gravitational condensation is more about the growth of an object by adding materials.
• Option 4: While solid particles can form from solar nebula materials (through processes like condensation of vapor - phase substances), the key aspect of gravitational condensation is the growth (increase in size) of an object by adding materials.

Answer:

An object increases in size due to the addition of materials.