Question

1. what is the role of gravity in keeping the planets in orbit around the sun? a. gravity pushes planets away from the sun. b. gravity has no effect on the planets. c. gravity pulls the planets into random path d. gravity pulls the planets towards the sun, keeping them in orbit.

Explanation:

To determine the role of gravity in planetary orbits, we recall Newton's law of gravitation. Gravity is an attractive force. The Sun's gravity pulls planets toward it. This centripetal - like force, combined with the planet's orbital velocity, keeps them in stable orbits.

• Option A is wrong because gravity is attractive, not repulsive.
• Option B is wrong as gravity is the main force governing planetary orbits.
• Option C is wrong because gravity provides a directed (toward the Sun) force, not a random path - determining force.
• Option D correctly states that gravity pulls planets toward the Sun, which is essential for maintaining their orbits.

Answer:

D. Gravity pulls the planets towards the Sun, keeping them in orbit.