Basic observation when you have the chance should provide enough proof to the conclusion that you are on another planet, so I doubt that'll be an explanation you need...

[Pausing, Jetfire rested his chin against his curled fist.]

And space travel is, technically, simple enough, but I doubt you'd be interested in that as more than an extrapolation of normal planetary travel, even if there's more to take into account when it comes to travelling through space.

So what sort of... er, explanation are you looking for?