Is space just too large for realistic interstellar/intergalactic travel?

I sometimes think how there could be millions of advanced civilizations, but space is so vast and the universal speed limit (light speed) is ridiculously slow that each civilization could be unaware of any others because they are so far apart.

Submitted January 16, 2022 at 12:14AM by Sora1274 https://ift.tt/3qyLT8A