SOLAR SYSTEM

Detailed explanation-1: -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-2: -Kepler’s laws determine the motion of the planets-their speeds and period and shape of the orbit. Newton’s laws of gravity and inertia explain why planets stay in their orbits. Newton’s laws of gravity and inertia are the two laws that best explain how the planets are able to stay in orbit about the Sun.

Detailed explanation-3: -Inertia and gravity combine to keep Earth in orbit around the sun and the moon in orbit around the Earth. A combination of gravity and inertia keeps the moon in orbit around the Earth. If there were no gravity, inertia would cause the moon to travel in a straight line.

Detailed explanation-4: -The Earth’s gravity pulls the Moon toward Earth. At the same time, the Moon has forward movement, or inertia, that partly counters the force of Earth’s gravity. This inertia causes the Moon to orbit Earth instead of falling toward the surface of the planet.

Detailed explanation-5: -A satellite maintains its orbit by balancing two factors: its velocity (the speed it takes to travel in a straight line) and the gravitational pull that Earth has on it.

Detailed explanation-6: -There is a continuous tug-of-war between the one object wanting to go forward and away and the other wanting to pull it in. These forces of inertia and gravity have to be perfectly balanced for an orbit to happen.