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Because the planets farther away from the sun had less gravity on them as they formed, making them large, gas planets. Also, the gases were less affected by the sun's gravity, as they were smaller than the solid particles.
https://en.wikipedia.org/wiki/Nebula

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THE INNER PLANETS ARE MAD3 OF ROCKS AND THE OUTER PLANETS ARE MAD3 OF GASES

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Because some of the planets have no atmosphere to makes the size of the planet to decrease or to have a small sizehttps://www.universetoday.com/36649/planets-in-order-of-size/

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https://phys.org/news/2018-03-theory-planets-solar-compositions.html

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Becuase some planets have no atmosphere which may lead it to be a smaller planet

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cus if maybe there was life on the other planets to suit the people needs and they all had different amount of stuff in there

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This is because the planets are different sizes and made of different things.

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They are diffrent because the distance and how they were made

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Beacause it balances the solar system

https://solarsystem.nasa.gov/resources/545/artists-concept-our-solar-system/

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Because some planets are further away and outer planets are made out of gas

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Because all of the planets were made differently, and are different distances away from the sun/heat

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Beacause The theory is the sun burned away matter from the inner planets, which is why these four are small rocky worlds. Mercury is very small but dense. Venus is almost as big as earth. Then comes earth, and Mars is quite a bit smaller than earth. Next is Jupiter, the first and king of the gas giants.

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because intellectuals hypethesiszed the closer planets are rocky and farther ones are gaseous

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They are different beacuse their distance and how they were created manny

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Because it puts a balance in to our solar system and they are different compositions because that is how they are held together

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Why do the 8 planets in our solar system have different sizes and compositions?
photo by: karmjyotish.blogspot.com