to have something to look at when you can see them
Yes. Besides earth there are seven other major planets and 5 recognised dwarf planets.
All planets in the solar system, besides earth, are airless. These planets are not able to contain human life.
The inner planets (except Earth), and in fact all of the planets besides Earth in our solar system, were named after Greek and Roman gods.
none
1). Halley's Comet 2). Earth's moon
They have no particular purpose
There are 8 planets (including Earth) in the Solar system.
Differentiation occurred in other inner planets, besides Earth.
most likely
Yes.
the one that paul comes from
mars