Answer:
They are further away from solar radiation and they are larger.
Explanation:
The temperature of the early solar system explains why the innerĀ planetsĀ are rocky and theĀ outerĀ ones are gaseous. As theĀ gasescoalesced to form a protosun, the temperature in the solar system rose. In the inner solar system temperatures were as high as 2000 K, while in theĀ outerĀ solar system it was as cool as 50 K.