> Or that I’m looking up a data point that I already actually know, just because I want to provide a citation.

Or what were know has changed.

When I was a child we knew that the North Star consisted of five suns. Now we know that it is only three suns, and through them we can see another two background stars that are not gravitationally bound to the three suns of the Polaris system.

Maybe in my grandchildren lifetimes we'll know something else about the system.