Rahahahaha.
Well.. the sky isn't the limit because there are footprints on the moon, but then again don't aim for the moon because even if you miss you won't land among the stars. Instead you'll end up in the vacuum of space where there is no air to breath and the half of you facing the sun will fry while the other half freezes solid. And anyway the nearest star is 4.3 light years away so life is pretty hopeless basically.