It's only a matter of time till someone, or something in the universe gets so advanced that they will reach our planet.

There is no doubt in my mind that there are other living things atleast as intelligent as us humans out there.

When i say "matter of time", i don't mean like 100 years, probably more like 1000, 10,000 1,000,000 or more. I Don't even know if our species will last that long. That's another question altogether.

Now, for space having and end, i don't know. I don't see how it could have an end.