[ck2]

Oh I understand the physics of it and why it's harder to grasp the concept on earth with gravity and friction.

But stop and think about it - the universe is like some kind of infinite iced-over pond where something will keep going and going and going once given momentum.

I mean in space it's sliding endlessly across "nothingness" - doesn't that kinda freak you out when you really think about it?

[colkassad]

It makes sense if you accept that there is no concept of absolute rest. The state of "moving" is really the natural state...when you apply force to something, you are just changing the parameters of that state.