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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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Q: Why are some planets referred to as the inner planets and others as the outer planets?
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Related questions

What are the names of gaseous planets?

The Outer planets are often referred to as Gaseous planets. The others are the "inner planets" or rocky planets.


Why are inner planets different than outer planets?

Inner planets. are inner & outer planets. are outer


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.


Inner an outer planet similarities?

The inner and outer planets are The same because The Inner planets are not made out of gas The outer planets are bigger than inners The outer planets are the coldest The Inner planets are rocky The inner planets are terrestrial The outer planets can't support life The inner planets have iron cores The outer are the furthest from the sun The outer planets haveno rocky surface


How do the inner and outer planets atmosphere different?

the outer planets are gaseous and the inner planets are not


Why do you compare outer planets to inner planets?

because inner planets are hot and outer planets are cold


What are 3 special characteristics of the three outer planets?

The inner and outer planets are The same because The Inner planets are not made out of gas The outer planets are bigger than inners The outer planets are the coldest The Inner planets are rocky The inner planets are terrestrial The outer planets can't support life The inner planets have iron cores The outer are the furthest from the sun The outer planets haveno rocky surface


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.


Are the inner planets smaller than the outer planets?

yes the inner planets are much smaller then the outer planets


What four inner planets are larger than the outer planets?

The inner planets are smaller than the outer planets.


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.