Gravity comes with mass so since a planet has mass there is some gravity. the bigger the planet the more mass it has. smaller planets have less gravity. so either way there is always some gravity on a planet.
There is gravity on the moon but it is a third of planet earth
The Sun's gravity works on each planet by keeping it in its orbit, because without gravity every planet would go off on a tangent and never come back.
Planet Earth, the Sun and stars, galaxies, ...
You can't actually have a planet without gravity. Everything would just fly away into space, if it was not held together by gravity.
Io is a moon of Jupiter, not a planet. Surface gravity is about 18% of the gravity on Earth.
The gravity on Mars or any other planet pulls you toward the planet's center.
The force of gravity of a planet is a product of its mass.
No Mercury, either the metal or the planet is not equal to gravity. Gravity is a force of nature, not a planet or a substance.
Gravity is one of a million things that is just right to keep our planet functioning. For instance without gravity our atmosphere would dissipate and everything living thing on the Earth would die. Without sufficient gravity our planet might look more like our moon. Gravitational interactions with our moon control the tides of Earth's oceans, another part of the puzzle that holds us together. Without the stability provided for our global environment by healthy oceans, our Planet would die.
The larger the planet mass, the bigger force of gravity it has.
Where there is mass there is gravity.
All planets have gravity.