Why does gravity keep the planets orbiting the sun and how many times stronger is gravity on Earth than on the Moon?
When planets move around the sun, their motion has inertia. The momentum of planets (mass multiplied by velocity) tends them to move in a straight line, while gravity generates a pulling force in the direction. The balance between these two determines that the planet orbits the sun in an elliptical orbit.
The planets all formed from this spinning disk-shaped cloud, and continued this rotating course around the Sun after they were formed. The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them. The gravity of each object pulls on every other object. The more massive the object, the stronger the pull. The sun is by far the most massive object in the solar system, so its gravitational field is the strongest, which is why planets orbit the sun.Gravity is the force that keeps planets in orbit around the Sun. Gravity alone holds us to Earth's surface. Planets have measurable properties, such as size, mass, density, and composition. A planet's size and mass determines its gravitational pull. Since the sun has a greater mass, it has a greater gravitational force that attracts the bodies with lesser masses. In addition, gravity produces the centripetal force, which is the inward pull that prevents the planets from moving out of their orbits. Orbits are the result of a perfect balance between the forward motion of a body in space, such as a planet or moon, and the pull of gravity on it from another body in space, such as a large planet or star. Gravity helped form our solar system, the planets, and the stars. It holds the planets in orbit around the Sun, and moons in orbit around the planets. The gravitational pull of the Sun and Moon creates the tides on Earth. The gravity of the moon is 1/6 of Earth. So if you stepped on a scale on the moon, you could subtract 83.5%. For example, that means 100 kg in weight would be 16.5 kg on the moon. The force of gravity on Earth is 6 times greater than on the moon. As a result, objects weigh 6 times as much on Earth as they do on the moon. A scientific instrument weighs 34 pounds on the moon. Earth's mass is about 81 times the mass of the Moon; therefore Earth's gravity is about 81 times greater than the gravity of the Moon. However, given that the Moon is smaller than Earth, the pull of gravity on Earth's surface is only about 6 times greater than the pull of gravity on the Moon's surface. The gravity on the moon is one-sixth of the Earth. This is because gravity changes with the change in planet / heavenly body where the weight of the object is measured. The more massive the object, the stronger the pull. The sun is by far the most massive object in the solar system, so its gravitational field is the strongest, which is why planets orbit the sun. Our sun is 27 million times larger than our moon. Based on its mass, the sun's gravitational attraction to the Earth is more than 177 times greater than that of the moon to the Earth. The gravity of the moon is 1/6th that of Earth. If you stepped on a scale in the same location, it would read 83.5% less than what it does here. This significant difference in gravity on the moon is due to its smaller mass compared to Earth, making lunar exploration a unique experience for astronauts. "The strength of gravity on the "surface" of the sun (that is, the photosphere, the shiny part we see), is 28 times stronger than the force of gravity on the surface of the Earth." Yes, I agree, it is about 27.6 times stronger but I also get a mere 14 days for the photosphere to rotate around the centre of the sun. Because the Sun is the largest, most massive object in our solar system, it also has the strongest gravitational force in our solar system. It pulls every one of the planets (and everything else) toward its center of mass.
Dear Rk Naresh ,
There are contradictions in your explanation,
The sentence of Chang Duan : 'When planets move around the sun, their motion has inertia' but the following explanation of it is in contradiction:
If act gravity force then how you can state the next:
'The momentum of planets (mass multiplied by velocity) tends them to move in a straight line, while gravity generates a pulling force in the direction. The balance between these two determines that the planet orbits the sun in an elliptical orbit.'
Another prove is expressed perfectly in the weiting of Louis Joseph Rancourt
Book Gravity explained logically, finally. Gravity explained logi...
I have other solution, but it is not written down in my last article:
Article Fizikailag-metafizikailag bizonyítható a graviton létezése
(The next parts: abstract, graviton, conclusion has English translation at my profile.
Regards,
Laszlo
What Chang Duan obviously meant to write was:
"The momentum of planets (mass multiplied by velocity) tends them to move in a straight line, while gravity generates a pulling force in the direction of the sun. The balance between these two determines that the planet orbits the sun in an elliptical orbit"
This is conform to Newton's classical mechanics and to observation.
It is also conform to electromagnetic mechanics, given that all macroscopic masses are made of elementary charged particle that attract each other according to the same inverse square law. The more massive a macroscopic mass is, the more elementary charged particles it will be made of, and the more intense will be the attraction between this macroscopic mass and other macroscopic masses.
We must accept this fact that, our universe with billions of galaxies, where each galaxy holds billions of solar system is a complete entity , and nothing is working under mechanical pull/pish as our last century icons thought that the universe is just one galaxy universe.
Saturn has tens of moons in different position.
Just ask yourself how could sun's gravity work to hold them in their orbit for billions of years by holding? or hold Saturn planet that is billion of mile away from sun and tens time bigger than earth?
Article The Mythos of Gravity Or (Newtonian and Einsteinian Gravity is a Myth)
regards
Every object in space exerts a gravitational pull on every other, and so gravity influences the paths taken by everything traveling through space. It is the glue that holds together entire galaxies. It keeps planets in orbit. The gravity of the moon is 1/6th that of Earth. If you stepped on a scale in the same location, it would read 83.5% less than what it does here. This significant difference in gravity on the moon is due to its smaller mass compared to Earth, making lunar exploration a unique experience for astronauts.The force of gravity on Earth is 6 times greater than on the moon. As a result, objects weigh 6 times as much on Earth as they do on the moon. A scientific instrument weighs 34 pounds on the moon. It is well known that a person's weight on the Moon is one-sixth that on Earth. The explanation for this is that the gravitational force on the Moon is 6 times less than that on Earth. Its 1.625 ms-2.Because the Moon is much closer to the Earth than it is to the Sun, and distance is the bigger factor when calculating gravitational force. So, even though the Sun has about 333,000 times the mass of the Earth, it only has about 28 times the Earth's gravity at this distance. Our sun is 27 million times larger than our moon. Based on its mass, the sun's gravitational attraction to the Earth is more than 177 times greater than that of the moon to the Earth. The planets all formed from this spinning disk-shaped cloud, and continued this rotating course around the Sun after they were formed. The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them. The Sun's gravitational force is like the tetherball rope, in that it constantly pulls Earth toward it. Earth, however, like the tetherball, is traveling forward at a high rate of speed, which balances the gravitational effect. This means that the planet neither flies out into space nor falls into the Sun. Gravity is the force that keeps planets in orbit around the Sun. Gravity alone holds us to Earth's surface. Planets have measurable properties, such as size, mass, density, and composition. A planet's size and mass determines its gravitational pull. Gravity is a very important force.
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