My wife and I have had this discussion, many times. And I thought this might be a good place to ask.
I modeled a trillion pennies one time (file available upon request).
Other than “Wow, it’s huge”. Can a human mind conceive how vast the universe is? I don’t care, Einstein, Hawking, Sagan, Tyson…
At 5,878,625,373,183.6 miles per year (light year), and the universe might be 13 billion years old…it’s fairly large.