if space travel was possible?

If you could travel through space, and since there isnt really any up,down, left or right with the exception of looking out the front of your window, how would you go, example (pluto and back) without getting lost?

a la autopilot

First of all you CAN travel through space ...... its done all the time by probes and satelites etc.
Second.... The universe is mapped...... all you have to do is set coordinates into a computer and set the course.
Kinda like a ship on the sea or an airplane in the sky.

You need to keep tabs on the sun, the other planets and the constellations. If you at all times know where the sun is you should be all right. But at Plutos distance the sun looks just like any other star...

what are you talking about there is a up and down it just depends on where you are. for example if you are above the earth then it is below you therefore it is down .basically up and down are based on your position in space.... and if you want to travel to another planet then you just aim your self in that direction and fire up the engines.

Hello Jay -

Well that's an interesting question. The way to travel through space is the way that we have been doing it for years with Apollo, Voyager, Pioneer, etc. That is, you first have to know where you are going, then you create an elliptical orbital path that will take you to that target at a point in time when it will actually be there. Finally, you start on the journey and make minor mid-course corrections to make sure you are flying the planned trajectory.

It is unfortunately not like driving to Chicago and deciding mid-way that you have changed your mind and want to go to Indianapolis instead. To do that would require tons of extra fuel that would probably never be used, but would waste even more fuel to launch in the first place. It would also extend year-long missions into decades-long endurance trips. Orbital mechanics is a fascinating topic and it forms the basis for efficient space travel.

Your question is appropriate, and raises more questions:
What do we know of the shape of the universe? Is it a ball, a carpet, or something different? Is it finished, or infinite?
What do we know of the different phenomena in the universe? Are there tunnels to go from point A to point B and gain billions of miles?
How certain can we be of the position of the object we're aiming at when we get there?
Even in the solar system, if we are reasonably knowledgeable about what's going on, we don't know much about anything beyond Saturn, and certainly not enough to be absolutely certain not to run into a big asteroid, comet or anything else that we have never seen before...
Just think about the number of celestial objects discovered each year.

Nobody seems to be mentioning inertial guidance systems yet. You are absolutely right that there's no up, down or sideways defined in space, so you have to "take it with you" in a sense.

Before launch, internal gyroscopes are set along certain axes and they keep those reference axes even as the craft changes its orientation. You can keep track of your orientation relative to those gyroscope reference axes.

During flight you can check your orientation by sighting on fixed stars, too.