Question

what makes the dust and gases, that form stars, fall inward? gravity friction

Explanation:

Gravity is the force that pulls matter together. In star - formation, the gravitational attraction between the dust and gas particles causes them to fall inward, leading to the formation of a dense core that can eventually become a star. Friction is a force that resists relative motion between surfaces and is not the main force causing the inward fall of star - forming material.

Answer:

Gravity