Why is earth the only planet with gravity?

yes and no, planet earth is the only earth with gravity because there is only one earth, however planet earth is not the only planet with gravity or even the only object with gravity. every single planet and every star and even every comet or asteroid has gravity but its not just objects in space; everything is made of matter and all matter attracts other matter which is what causes gravity so the chair your sitting on, the computer in front of you, and even you have a small amount of gravity.

All planets have gravity, not just Earth.

Earth. Mars' gravity is only around 38% of Earths.

NO. They all have gravity.

All of them do. There's no planet where the gravity is the same as on Earth.

No. All objects have a gravitational field. The more massive the object, the higher the gravity.

Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.

Gravity is a force that pulls you down to the centre of a planet. If it was zero gravity you wouldn't be pulled down. Earth is the only planet that has gravity that's why you "float" in space. I hope this has helped.

Jupiter has the strongest gravity of any planet in the solar system, more than twice as strong as the gravity on Earth. Neptune (1.14 x Earth gravity) and Saturn (1.06 x Earth surface gravity) also have stronger gravity than Earth.

If Earth were the only planet operating with gravity, Earth would attract all the other planets to itself. The other planets maintain their position by their gravitational pull.

Yes. At least, the gravity resulting from planet Earth.

The planet Jupiter has the most gravity. It is 2.64 that of Earth.

No known planet has the exact same gravity as Earth does, but Venus comes pretty close. Its gravity is about 90% what it is at Earth's surface.

You already stated in the question that it has 3.4 times the gravity of Earth.

The closest we have to this is Jupiter, which has 2.53 times the surface gravity of Earth.

Gravity ("surface gravity")on Mercury is 0.38 that of Earth.

Mars has less gravity.

Jupiter, the biggest planet in the solar system, has far more gravity than the Earth. Only the Sun has more gravity than Jupiter in our solar system.

Earth: Space: - is a planet - No gravity - supports life - Vaccum - gravity - No gravity or atmosphere - atmosphere

No. My planet (and presumably yours as well) is Earth.

Gravity on a planet is directly related to its mass. Venus is very close in mass to earth with about 10% less mass. Therefore, Venus' gravity is about 90% that of earth.

On Earth, a kg is 9.81N. Presuming only that this is on Earth or a planet of the same gravity, you have (30)(9.81), or 294.3N.

I think the planet earth has more gravity

The earth does not have more gravity than any other planet. It does have the highest surface gravity of any of the inner planets, but Jupiter (2.6 g), Neptune (1.14g) and Saturn (1.1g) each have a higher surface gravity than earth. The surface gravity of the three planets is written as a function of (as the multiple of) the surface gravity of earth (g). (If a planet had twice the surface gravity of earth, its surface gravity could be written as 2g.)

Saturn has a stronger gravity than Earth because the diameter of the planet Saturn is larger than the diameter of the planet Earth. This implies that Saturn has a greater mass than the planet Earth and from Newton's law of gravity, a larger mass planet has a greater gravitational pull. Therefore, Saturn has a greater gravity than Earth. Edit: Yes, Saturn does have a greater mass than the Earth. However we usually mean "surface gravity" when we talk about the "gravity" of a planet. Because it has a big diameter you would be further from the centre of mass than on the Earth. This roughly cancels out Saturn's greater mass and so Saturn's surface gravity is only slightly greater than Earth's (according to most sources of reference).