Why is there only gravity on Earth and not on other planets?

Answer 1

Gravity doesn't "only happen on Earth" - Gravity happens all over the whole universe. Gravity is what keeps all the planets orbiting the Sun - and it is what keeps our solar system obriting within the Milky Way galaxy, and that whole galaxy is itself subjected to the gravitational pull of all other bodies in the universe. Every body - be it a star or a pea - exerts a gravitational force on every other body in the universe. Gravity is a property of matter - everything has it. Gravity is weaker in some places - such as on the Moon where it is one-sixth as powerful as on Earth, but that is due to the composition of the Moon.

Answer 2

It's not. All planets, stars, moons, and everything else has gravity. Also, many of the planets have an atmosphere, but their air isn't the same as the air here. For example, the air on Venus has much more sulfur and carbon dioxide than the air here, so we couldn't breathe it safely. And the air on Jupiter is mostly Hydrogen.

Answer 3

The question is invalid. Earth's gravitational field extends thousands of miles past the Earths outer atmosphere.

or

The gravitational pull of the moon keeps us on the earth surface so we arent floating around althought that would be cool the moon pulls in the tides at night.

2nd Answer:

May I try to answer your question using physics? I promise there is no pain. (g)

1. Every object with mass (on Earth, we call it weight) also has gravitational attraction.

2. When scientists calculate the pull of gravity, they always assume that the gravitation goes clear to the center of each object that they're studying.

3. So, if you are in your normal location, the pull between you and earth can be easily calculated. But what if you were on top of the highest mountain in the world? The distance from the center of the Earth to the center of you would be longer, and so the gravitational pull between you and the Earth would be very slightly less. In fact, if you could fly out into space, the Earth and you would attract each other even less.

4. If you could stand on the surface of the Moon (or Mars, or Venus, or . . .) you would find you and the Moon (or Mars, or Venus, or . . . ) attracting each other . . . but the Earth and you would still pull on each other, just very much less than when you were at home.

5. Is gravity just on the surface? Well, think of the miners who work a mile or two underground, or boats that sink in the ocean, sometimes many miles . . . in both cases, the pull of gravity still pulls the people (or boats) toward the center of each other, or at least until they hit something solid.

6. Believe it or not, but you and, say, your best friend have the pull of gravity between each other. Gravity is the weakest natural 'force', so you don't feel the pull between you and your friend - it is too weak to feel. But get close to a huge object, oh, say, like the Earth, and you find that the huge object has a very noticable pull simply because it is so huge.

7. If you stood on one of the really huge planets, like Jupiter, say ( you can't because there is no solid ground, but still . . . ) There would be such a large pull of gravity between Jupiter and you that you would not be able to stand up, no matter how hard you tried.

The Moon and Earth have a gravitational pull on each other that:

a. Keeps the Moon orbiting around Earth, not flying out into space, and

b. Creates tides in each other's surfaces, including dirt, rocks, mountains, valleys, and oceans. A 'tide' is really a ripple or narrow bulge that the Moon drags along the surface of the Earth as the Moon orbits around the Earth. Land is too stiff to really notice that it is bulging, but water moves easily and bulges quite a bit. This cause swhat we call the 'ocean tides'. The Sun and Earth pull on each other, too, and the Sun causes smaller tides. That is why we have so many different tides in addition to "High tide" and "Low tide".

Answer 4

Other planets do have gravity, but the strength of gravity can vary depending on the mass of the planet. Earth's gravity is strong because of its size and mass. Smaller planets like Mars have weaker gravity, while larger ones like Jupiter have stronger gravity. Gravity is a fundamental force that exists everywhere in the universe, including on other planets.

Answer 5

All the planets have gravity, gravity is a universal force, it keeps the solar system and all the galaxies together.

Answer 6

Every planet has gravity.