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Asked by minecraftian to Angela, Gopal, Hannah, Becky, Vince on 14 Jun 2013. This question was also asked by cristiano97, ajhd22.
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Hannah Little answered on 14 Jun 2013:
All planets have gravity, but gravity is stronger on bigger planets than on smaller ones. Which is why people float on the moon, because the moon is smaller than Earth it has less gravity.
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Angela Hackett answered on 14 Jun 2013:
Other planets do have gravity. Every object which has mass has gravity. The amount of gravity an object has depends on how heavy the object is and how far away it is from the object it pulls on. A very heavy object, like the Earth, has a larger force of gravity but something that has a smaller mass, like the Moon, has a lower force of gravity so when astronauts jump on the Moon they can go further that if they’re on Earth.
Also, the closer objects are to each other the stronger the force of gravity acts on them. -
Vince Hall answered on 17 Jun 2013:
All things that have mass have gravity. A rock floating in space has gravity, so other things will be attracted to it.
The Earth is essentially a rock floating in space, but it has a lot of gravity, so we can easily feel it. The Earth is pulled towards a human, you for example, because you have mass, so it works both ways. When you jump into the air the Earth and your body are pulled towards each other by their gravity, so you come together again (you fall back to Earth).
A place like Mars has less gravity than Earth, only about 38 % of Earth’s, so Earth has 2.6 times as much as Mars.
Jupiter has 2.5 times the gravity of Earth. Jupiter is much bigger than Earth (radius is 11 times larger), but it is made of lots of hydrogen and helium, which are very light gases, so they don’t cause that much more gravity than Earth.
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