[Oh boy. Don't ask a scientist questions.]

A planet is what we live on! It's a big, biiiiig world out there--and we're not even the only planet in existence! Although Earth is one of the only planets that have life in our...um, corner. [Tossing around words like "galaxy" and "universe" might be bad.] As evident by this place, anyway.

Soldiers...they're people that follow the orders of one or more person that's in charge of them. It can involve defense, direct combat or--well, mass killings in his case.