Question 28

Gravity causes particles in outer space to join together into larger and larger objects.

Gravity is the fundamental force that attracts particles and celestial bodies toward one another, enabling the formation of larger structures such as stars, planets, and galaxies.

A) Air resistance

Air resistance is a force that opposes the motion of objects through the air. In the vacuum of outer space, there is no air, thus air resistance does not play a role in the aggregation of particles or the formation of larger celestial bodies.

B) Tension

Tension is a force that is transmitted through a string, rope, or wire when it is pulled tight. This force is not relevant in the context of outer space, where particles are not connected by such means and thus cannot influence the joining of particles into larger objects.

C) Friction

Friction is the resistance encountered when two surfaces move against each other. In outer space, the conditions are vastly different, and friction does not contribute to the process of particles coming together to form larger celestial objects.

D) Gravity

Gravity is the attractive force that pulls particles together, facilitating the formation of larger structures in space. It is the primary force responsible for the aggregation of matter, leading to the creation of stars, planets, and galaxies.

Conclusion

Gravity is the definitive force that causes particles in outer space to join together, as it acts over vast distances and draws matter together effectively. The other options—air resistance, tension, and friction—are not applicable in the context of outer space and do not contribute to the formation of larger celestial objects. Thus, gravity stands out as the only correct answer.