Will it be possible in the future to travel to other stars ? What difficulties are there?
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As resistance and gravity are both negligible in space, the critical issue isn't the ability to push a craft in the right direction but instead the amount of time needed to arrive. If we consider the nearest star as a potential - Alpha Centauri - at 4.3 light years it would take 80,000 years using extant technology. (And this is "next door")
So to really "get there" would require a significant breakthrough in the realm of physics --- yes, the "wormhole" idea, or some other quantum-mechanical contrivance that circumvents Newtonian mechanics, or time, or both. Energy and/or time are the main issues. In order to take enough fuel using current technology to propel and to stop (it ...
This solution discusses some of the potential issues with interstellar travel such as time frame, fuel source, food source and others. Links are provided for further topic exploration.