Rocket Man

Instead of translating, tell me what this song means...

And I think it's gonna be a long long time
Till touch down brings me round again to find
I'm not the man they think I am at home
Oh no no no I'm a rocket man
Rocket man burning out his fuse up here alone

Mars ain't the kind of place to raise your kids
In fact it's cold as hell
And there's no one there to raise them if you did
And all this science I don't understand
It's just my job five days a week
A rocket man, a rocket man