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All planets in our solar system have enough gravity to have their own moons. However two, Mercury and Venus, formed in ways that they don't have any moons.
Mercury is a borderline case: while its gravity is theoretically capable of holding a moon, its nearness to the sun and rapid orbit mean it would be very difficult for a moon to remain in a stable orbit.
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∙ 8y ago
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What if the world was bigger?
Our gravity field would be large enough to make Mars a moon instead of a planet.
Why doesnt the moon have enough gravity on it to pull us down?
It does. Astronauts on the moon can jump higher than they do on Earth but they still come back down. The moon's gravity is weaker than Earth's because the moon has less mass.
What is the gravity on the planet Io?
Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.
Why don't humans feel gravity on the moon?
We do experience the gravity of the moon, as does the entire planet. But since the planet is essentially in freefall with respect to the moon's gravity we feel effectively weightless with respect to the moon. Now, when standing on the moon, humans do feel its gravity, but its strength is only about 1/6 of that of the Earth, due to its smaller mass.
How much more is gravity on the moon than the earth?
The moon has gravity but the earth has more because living people live in the planet.
Why is there a discussion over whether Pluto should be a planet?
Pluto is a moon because it doesnt have enough gravitational pull to be a planet
What if the world was bigger?
Our gravity field would be large enough to make Mars a moon instead of a planet.
Why doesnt the moon have enough gravity on it to pull us down?
It does. Astronauts on the moon can jump higher than they do on Earth but they still come back down. The moon's gravity is weaker than Earth's because the moon has less mass.
What is the gravity on the planet Io?
Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.
How does man stands on moon without gravity?
There is gravity on the moon but it is a third of planet earth
What holds the Earth's atmosphere in place?
The atmosphere is held in place by the earth's gravity. Gravity is related to mass, the more mass a planet has, the more gravity. A much smaller planet like mercury or a body such as the moon will have less gravity, not enough to hold an atmosphere - the gravity is not strong enough to prevent the gas particles from escaping into space.
What planet or moon has no gravity?
No such place- ALL have some degree of gravity.
What holds a moon in orbit?
The gravity of its planet.
Why can't the atmosphere of gas giant planets escape into space?
Where a planet or moon has an atmosphere, it is the gravity of the moon or planet that holds the atmosphere on the planet or moon.
Which planet has the most greatest gravity?
Jupiter has the strongest gravity. The bigger the planet, the stronger the gravity. The moon is kind of small, so it's gravity is weaker.
What planet has little gravity?
our moon or mercury or Pluto
What keeps a moon in orbit around a planet?
gravity :)
