other star systems, not galaxies, likely enough, if at all. The nearest star system is roughly 4 light years away;: it takes light to travel 4 years. At 0.1 light speed, a 40 year trip, where with 0.1c time dilation is still pretty negligeble. There are literally more than 100 billion (with a b) stars in OUR galaxy alone.

The neighbor galaxy, on the other hand, the Andromeda galaxy, is 2 1/2 -million- light years away.

So there are certainly others out there. Statistically, i's mid-blowingly unlikely that we're alone. At the same time, making it here is mind-blowingly difficult. Not impossible. But difficult.