What are problems of travelling to different galaxies?
The galaxy nearest to us is Andromeda and it is 2.5 million light years away. Since we cannot travel at the speed of light, let us say we were able to travel at 90% the speed of light, it would take us about 2.8 million years to reach Andromeda. The most distant galaxy is about 13 billion light years away.
We do not have a way to travel to the nearest star, Alpha Centauri, which is only 4.3 light years away. Light travels about 9.4 trillion miles in one year which places Alpha Centauri roughly 40 trillion miles from earth. Divide that by 100,000 miles an hour, the probable upper limit of present technology, and you quickly see the problem of space travel.