SOLAR SYSTEM

Detailed explanation-1: -A planet orbits the sun at a constant speed due to gravity and inertia. The force of gravity pulls a planet toward the Sun. Inertia keeps a planet moving in a forward direction. When the force of gravity balances a planet’s inertia the result is circular motion.

Detailed explanation-2: -Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth.

Detailed explanation-3: -Orbital Motion: Newton concluded that two factors-inertia and gravity– combine to keep Earth in orbit around the sun, and the moon in orbit around Earth.

Detailed explanation-4: -When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance.