<font color="yellow">I mean when you fly a plane you can go up and down and increase altitude. <br /><br />If you fly through space , can you go up and down? Or are all the planets and stars on the same level like a sheet of paper? <br /><br />Something I never seen asked before, but im sure it was.</font><br /><br />You can go towards or away. Up and down implies a gravitational gradient, hence going away would be like going up (up, up, and away) and going towards would be like going down. Going really, really down, you start to observe the smaller things in life and even smaller than that.<br /><br />The universe is not like sheet of paper. It is more like an ocean with plenty of neutrally-buoyant "buoys" called galaxies that have neutrally-buoyant "buoys" of their own called stars and nebulae. The ocean is four dimensional, hence, the buoys don't float to a top, unless you suscribe to the accelerating universe hypothesis <img src="/images/icons/wink.gif" />.