gravity
Gas giants have a higher mass. This means that the gas giants have a more gravity to hold moons in orbit around them.
The Terrestrial planets have a higher density. Their structure includes a large percentage of rock, while the Jovian planets are composed mostly of gas.
The terrestrial planets are primarily composed of rock and the jovian planets are mostly gas (primarily Hydrogen). Rock has a higher density than Hydrogen, giving the terrestrial planets a higher density.
Jovian planets are more massive and lower in average density. Terrestrial planets are smaller and higher in average density.
There are the four inner, rocky planets are also known as the terrestrial planets. These are; Mercury, Venus, Earth and Mars. Then there are the four outer gas giant planets are Jupiter, Saturn, Uranus and Neptune. The inner planets are smaller and have a higher average density. The outer planets are much larger, but have no real surface - just atmosphere that gets thicker as you travel inwards.
gravity
Gas giants have a higher mass. This means that the gas giants have a more gravity to hold moons in orbit around them.
The Terrestrial planets have a higher density. Their structure includes a large percentage of rock, while the Jovian planets are composed mostly of gas.
The terrestrial planets are primarily composed of rock and the jovian planets are mostly gas (primarily Hydrogen). Rock has a higher density than Hydrogen, giving the terrestrial planets a higher density.
Jovian planets are more massive and lower in average density. Terrestrial planets are smaller and higher in average density.
The Jovian planets have much higher escape velocities.
The inner terrestrial planets, including Mercury, Venus, Earth, and Mars, are unique in several ways. They are closer to the Sun and have shorter orbital periods compared to the outer planets. They also have solid, rocky surfaces and higher densities. Additionally, the inner terrestrial planets have thinner atmospheres, with Mars having a very thin and mostly carbon dioxide atmosphere, while Earth has a thick atmosphere that supports life.
There are the four inner, rocky planets are also known as the terrestrial planets. These are; Mercury, Venus, Earth and Mars. Then there are the four outer gas giant planets are Jupiter, Saturn, Uranus and Neptune. The inner planets are smaller and have a higher average density. The outer planets are much larger, but have no real surface - just atmosphere that gets thicker as you travel inwards.
The four inner, terrestrial or rocky planets all have similar densities, much higher than the four outer gas giant planets (though the outer planets are much larger and more massive).
Dependant on how the debris from supernovae is moving, the proportions of certain materials present, and the initial conditions of solar systems forming different combinations of terrestrial and Jovian planets are formed. Terrestrial planets are comprised of heavier particles (ie. of higher relative atomic mass) meaning they have stronger gravity which leads to higher density planets than the gaseous Jovian planets. A Jovian planet can be thought of as a failed star - it has all the elements needed to fuel nuclear fusion, but not enough gravity to attain the nuclear activation energy required. So the Sun started as a large cloud mostly comprising of gases, and terrestrial planets were formed from clouds mostly consisting of heavy solids.
Each of the four inner planets have a clearly defined terrain. They are different to the gas planets, which don't have a clear solid surface. The inner planets are also much smaller and less massive, yet have a higher density than the outer planets. The inner planets have fewr moons due to their smaller mass and size. As they are closer to the sun, they orbit the sun in less time and are also warmer.
The gas giant planets (Jupiter, Saturn, Uranus, and Neptune) are much farther from the Sun than the inner planets, and so receive less solar heating. They are very hot in their interiors, however, due to compression from the large overlying atmosphere.It is difficult to accurately theorize what their mass, size, and composition would be if they were in closer orbits, but they would have higher average temperatures. The second reason for the low average temperature of gas giants is their large diameter, with a greater volume of atmosphere farther from the layers that have higher compression and heat retention. Even for Earth, the majority of the atmosphere (in the higher altitudes) is extremely cold by surface standards.