Question

What do the outer planets differ in

Answer 1

the outer planets differ in many many ways. this question looks a little incomplete. outer planets will be colder than the earth 'cos they're further away. They'll also probably take longer to orbit the sun.

Answer 2

The outer planets can be different from the inner planets because the outer planets are gas planets and are also much larger then the inner planets. They also take a longer time to rotate the sun and are colder then the inner planets. There are 8 planets in all since Pluto is a dwarf plant and Earth is the only planet that has contains life.
Hope this helps :3