[KTM rider]

the only way meaningful space travel could be possible would be to slip in and out of another dimension where time does not exist

[jmacusa]

True since, I believe that as you approach the speed of light, for the traveler time seems to be relative but to a stationary object much time has gone by. Which it would seem to me that if you could travel somehow to the nearest star or galaxy, before you'd even gone a quarter of the distance or less , everything and everyone you left on Earth would be long gone.

[crusher2013]

You might be right.

The other major problem is how to keep the ship from being destroyed by a grain of sand while traveling even a fraction of the speed of light.

If your in another dimension then this would not be a problem.

[Bloody Sam Roberts]

the only way meaningful space travel could be possible would be to slip in and out of another dimension where time does not exist

Time does not exist. Time is a construct of the human mind based on observations of movements of heavenly bodies.