There are distances of time as well as space. The universe could be like a forest of fireflies with life winking in and out over time instead of like a christmas tree with many lights softly glowing all at once. I don't think we are 'alone' as though we were the only light that ever came on or ever will come on. But it might be like that, little fireflies of civilizations. The only way to tell would be to stay 'on' for a very long time, and so far we haven't done this. Maybe some others have and they might visit, or we might find traces one day, we'll see. I feel like all these other places and vastness are here for a reason, so we may be able to visit them after death once our physical constraints are removed and sin is purged from us. Once we are Pure.
"Well done, good and faithful servant; thou hast been faithful over a few things, I will make thee ruler over many things," or cities, or in some translations I think "kingdoms"
Matthew 25:14-25
Luke 19:12-19