Question

which statement best illustrates the role that gravity played in the formation of the solar system?
gravity caused the nebula to cool enough for planets to form.
gravity removed excess gas and dust from the cores of the planets.
gravity pulled particles of dust and gas together to form planets.
gravity allowed the nebula to expand and move outward

Explanation:

• Option 1: Gravity does not cause cooling. Heat loss mechanisms like radiation are responsible for cooling.
• Option 2: Gravity is not the force that removes excess gas and dust from planet cores. Processes like solar wind and planetary outgassing play more significant roles.
• Option 3: According to the nebular hypothesis, gravity pulls dust and gas particles together (accretion) to form planets.
• Option 4: Gravity is a force of attraction, not expansion. It would pull the nebula inward, not allow it to expand outward.

Answer:

Gravity pulled particles of dust and gas together to form planets.