The asteroid belt is between mars and Jupiter and no planet holds it in position it's actually orbiting the sun it best imagined looking at Saturn with the planet being the sun and the moons the planets and the rings the asteroid belt it's all the planet.
Classical planets are the five planets visible to the naked eye from Earth: Mercury, Venus, Mars, Jupiter, and Saturn. They have been observed since ancient times and hold significance in various astrological and astronomical systems.
Jupiter has the most gravity among all the planets in our solar system, and it is able to hold onto its massive atmosphere of gases, primarily hydrogen and helium. Its strong gravitational pull prevents these gases from escaping into space.
Jupiter has enough gravity to hold on to most gases because it is the largest planet in our solar system. Its strong gravitational pull prevents gases from escaping into space, allowing it to maintain its thick atmosphere.
Jupiter is the largest planet in our solar system, with a diameter of 142,984 and a mass of 1899x1024kg. Not only could Jupiter hold all the planets inside of it if it were hollow, but it would also fit all the moons inside of it as well (and there would still be room for more!).
The term minor planet is still used, but after reclassification in 2006 these are now generally referred to as dwarf planets. Dwarf planets orbit the sun, but are not satellites, that is to say that they do not orbit another planet, since then they would be classified as moons. They are big enough to hold an ellipsoid shape under their own gravity (like a squashed sphere), but have not cleared their orbit of other objects. That is to say that at the same distace out, there is a significant amount of other matter that is not part of the dwarf planet.
If you could do the measurements at the same distance from both planets, you'd find that the gravitational forces between you and Jupiter would be about 318 times as strong as the forces between you and the Earth.
Planets would most likely drift until they were attracted to the next largest center of gravity, say Jupiter. But without a centre of gravity, the planets would have nothing to hold themselves in a fixed point and would simply drift.
Jupiter gases do not escape because Jupiter has enough gravity to hold the gases in place.
Outer planets like Jupiter and Saturn have strong gravitational fields that hold onto their abundant gas layers. Additionally, these planets are further away from the Sun where solar winds are weaker, reducing the loss of gas. The large mass of these planets also contributes to their ability to retain their gas atmosphere.
Jupiter
Jovian planets can also be called gas giants. They are Jupiter, Saturn, Neptune and Uranus. They are mostly made up of gas, but they have a rocky core, (somewhere!). They are said to lack a solid surface, But they actually don't really have a surface at all! The gases that they're made up from get thinner and thinner as you get closer to the core.
The outer planets are the planets that are made of gas. Each of the outer planets are mad of gas and can not hold life.