# What does kepler’s third law imply about planetary motion

## What does Kepler’s second and third law imply about planetary motion?

Universal gravitation implies that the planets further from the Sun will move more slowly than the planets closer to the Sun (Kepler’s third law). … Universal gravitation implies that when a planet is closer to the Sun in its orbit, it will move faster than when it is farther from the Sun (Kepler’s second law).

## What does Kepler’s third law of planetary motion say?

Kepler’s Third Law: the squares of the orbital periods of the planets are directly proportional to the cubes of the semi major axes of their orbits. Kepler’s Third Law implies that the period for a planet to orbit the Sun increases rapidly with the radius of its orbit.

## What does the third law of planetary motion mean?

The third law states that the ratio of the squares of the orbital period for two planets is equal to the ratio of the cubes of their mean orbit radius. This indicates that the length of time for a planet to orbit the Sun increases rapidly with the increase of the radius of the planet’s orbit.

## What are Kepler’s 3 Laws Why are they important?

Explanation: Kepler’s laws describe how planets (and asteroids and comets) orbit the sun. They can also be used to describe how moons orbit around a planet. But, they do not just apply to our solar system — they can be used to describe the orbits of any exoplanet around any star.

## How much stronger is the gravitational pull of the sun on Earth at 1 AU than it is on Saturn at?

Test 1 (part 2)QuestionAnswerAccording to Newton’s Law of Universal Gravitation if the moon were three times further from Earth the force by Earth on the Moon would:decreases by a factor of 9How much stronger is the gravitational pull of the Sun on Earth, at 1 AU, than it is on Saturn at 10 AU?100X.

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## When a planet is closest to the sun in its orbit?

The place where the planet is closest to the Sun (helios in Greek) and moves the fastest is called the perihelion of its orbit, and the place where it is farthest away and moves the most slowly is the aphelion. For the Moon or a satellite orbiting Earth (gee in Greek), the corresponding terms are perigee and apogee.

## What are Kepler’s 3 laws in simple terms?

There are actually three, Kepler’s laws that is, of planetary motion: 1) every planet’s orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its …

## What does Kepler’s third law apply to?

“The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit” That’s Kepler’s third law. In other words, if you square the ‘year’ of each planet, and divide it by the cube of its distance to the Sun, you get the same number, for all planets.