I am an unapologetic sucker for any size comparison chart. I found this one, which isn't quite as powerful as some of the videos I've seen on the same topic. But it's still pretty cool.
Check out this link for a more interactive view of how big things are> --> CLICK ME
So remember, when you send the characters in your space opera to Mu Cephi, don't forget that it's pretty big. It might make for a complicated calendar for folks living there.