What is inner and outer planets?

The are four innermost planets in the Solar System (Mercury,Venus, Earth, and Mars). Outer planets are large in size compared to inner planets. There are four outer planets in our solar system namely Jupiter, Saturn, Uranus, and Neptune.

What are some facts about both inner and outer planets?


  • The four inner planets have shorter orbits, slower spin, no rings, and they are made of rock and metal.
  • The four outer planets have longer orbits and spins, a composition of gases and liquids, numerous moons, and rings.
  • The outer planets are made of hydrogen and helium, so they are called gas giants.

What are 5 differences between inner and outer planets?

Inner planets have fewer moons, small, silicate surface, nickel-iron core, higher density and rotate more slowly compared to outer planets. Outer planets have a greater number of moons, no solid part; rotate faster, have a lower density as well as rings in some cases (Jupiter and Saturn).

Why are the inner and outer planets so different?

The temperature of the early solar system explains why the inner planets are rocky and the outer ones are gaseous. As the gases coalesced to form a protosun, the temperature in the solar system rose.

This is because the outer planets are in a gaseous state while the inner planets are solid and more compact. Consequently, the density of the inner planets is greater than that of the outer planets. Despite the density differences, the mass is smaller for the inner planets than the outer planets.

Are the outer planets bigger than the inner planets?

The outer planets are so much larger than the inner planets that they make up 99 percent of the mass of the celestial bodies that orbit the Sun. Why are the terrestrial planets smaller? While terrestrial planets accreted from planetesimals made of rocks and metals, they ended up too small to capture significant amounts of the abundant hydrogen and helium gas in the solar nebula .

What are the main difference between inner and outer planets?

– Outer planets are made up of gases, while inner planets are made up of solid rocks. – Inner planets don’t have rings orbiting them, while outer planets have. – Outer planets often have dozens of satellite or moons, while inner planets have little or no moons.

Why are inner planets smaller then outer planets?

There were relatively few elements of any other kind in a solid state to form the inner planets. The inner planets are much smaller than the outer planets and because of this have relatively low gravity and were not able to attract large amounts of gas to their atmospheres. .