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Because the four inner planets (Mercury, Venus, Earth, Mars) are the four planets closest to the sun.

These smaller planets are all inside the asteroid belt. The larger planets: Jupiter, Saturn, Uranus, Neptune) are outside the asteroid belt and thus called the outer planets.

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Which planets in the solar system are referred to as the inner planets and outer planets?

The 4 Inner planets (mostly rocky and solid):MercuryVenusEarthMarsThe 4 Outer planets (mostly dense gaseous atmospheres):JupiterSaturnUranusNeptuneNotes:Pluto, a dwarf planet, was an outer planet before it got reclassified, but resembles the inner planets.The inner and outer planets are separated by the asteroid belt.When dwarf planets are included, Ceres counts as an inner planet and all the other dwarf planets count as outer planets.


How do the inner and outer planets atmosphere different?

the outer planets are gaseous and the inner planets are not


What do the outer planets have that the inner planets do not have?

outer planets are gas giants whille inner planets are just rocky planets. that includes that outer planets have significant amount of mass than the inner planets


Are the inner and outer planets different?

The inner planets are all rocky planets. The outer planets are completely made up of gases. The inner planets are much smaller than the outer planets.


What four inner planets are larger than the outer planets?

The inner planets are smaller than the outer planets.


Why are some planets referred to as outer planets?

The planets in the solar system can be sorted to two types: inner planets that are the four closer planets to the Sun, which are rocky and small. And outer planets which are the four other planets which are gaseous and very large.


What are 3 differences between the outer and inner planets?

The inner planets are small, the outer planets are huge in comparison.The inner planets have rocky surfaces, the outer planets are gas giants.All of the outer planets have rings. None of the inner planets does.All of the outer planets have several moons, some of them quite large.


Which group of planets has more in common the inner planets or the outer planets?

The inner planets (Mercury, Venus, Earth, Mars) have more in common with each other compared to the outer planets (Jupiter, Saturn, Uranus, Neptune). The inner planets are often referred to as terrestrial planets and are characterized by their solid surfaces and relatively small sizes, while the outer planets are gas giants with no solid surface and much larger sizes.


What are the inner plaents?

The inner planets are Mercury, Venus, Earth, and Mars. They are referred to as inner planets because they are closer to the Sun compared to the outer planets. These planets are primarily composed of rock and metal.


Who has higher density inner planets or outer planets?

Inner planets


What is the next thing after the inner planets?

After the inner planets you get the outer planets.


Why are planets named inner and outer planets?

The "inner" planets are on the "inside" of the asteroid belt, while the "outer" planets are on the "outside" of it