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Why does a moon remain in orbit around a planet?

Magnetism!Your answer about how the moon stays in it's orbit is half correct. You indicate it's because of gravity. Gravity is the "pull" (or +) force coming from the earth but there are TWO forces in balance required to keep the moon in orbit: an equal and opposite force that I call "energy" or (-). Without BOTH in Balance (0), the moon would crash into the earth. Same with the sun, stars, electrons and all of the bodies in the Universe of Light. Mathematically:(+) + (-) = 0where Zero represents Balance and NOT "nothing" as in the world of "things" there cannot be "no-thing"…There is the mathematical proving of the Unified Field Theory!


Why does they moon stay in orbit around the planets?

Actually, it's MAGNETISM!Your answer about how the moon stays in it's orbit is half correct. You indicate it's because of gravity. Gravity is the "pull" (or +) force coming from the earth but there are TWO forces in balance required to keep the moon in orbit: an equal and opposite force that I call "energy" or (-). Without BOTH in Balance (0), the moon would crash into the earth. Same with the sun, stars, electrons and all of the bodies in the Universe of Light. Mathematically:(+) + (-) = 0where Zero represents Balance and NOT "nothing" as in the world of "things" there cannot be "no-thing"…There is the mathematical proving of the Unified Field Theory!


What is the reaction force of the gravitational force by earth on a satellite orbiting earth?

According to Newton's Third Law, there is a pair of forces: Earth attracts satellite; satellite attracts Earth. It really doesn't matter which of the two forces you call the "reaction force".


Are The forces of the earth and moon are equal?

The force the Earth has on the Moon is exactly the same force the Moon has on the Earth. Since the Moons force on the Earth along with the Earth's force on Moon are acting on opposite directions this follows the concept of Newton's 3rd law.


How do the moons stay in and orbit Jupiter?

"Jupiters moons orbit Jupiter because gravity pulls them"Is only half correct. Gravity from Jupiter does, indeed "pull" them toward Jupiter. But, there is an equal and opposite Force, we'll call it Energy, that is "pushing" and keeping those moons (as well as our moon, our earth and our atom's electrons) from flying out of orbit. Those Two Forces, in Balance, can be felt by holding two bar magnets toward each other, then reversing them: one "pull', one "push" Force!Magnetism is the Cosmic Glue that holds the Universe together!Physics is pretty simple, huh..?Another Answer:Unfortunately, 'Magnetism is NOT the Cosmic Glue that holds the Universe together'. Gravity is the force that 'helps' to hold the Universe together, but is not really doing its JOB. The Galaxies of the Universe are flying apart from each other at an Accelerating Rate. Possibly due to "Dark Energy".As for the Moons, well, the force of Gravity and the Centrifugal (and Centripetal) Forces are in balance, so the moons will stay in Orbit. Think of a Ball on a string being swung around your head in a circle. Then think of Gravity (and Centripetal force) as the String holding the Ball in its circular path.