[pfdietz]

Astronomers have not discovered the Milky Way's biggest stellar black hole. They have found the largest stellar black hole of all the galactic stellar black holes they've found so far. Since the Milky Way likely has 100 million stellar black holes, finding the largest is going to be quite a task.

Bart: this is the biggest stellar black hole.

Homer: this is the biggest stellar black hole so far.

[exegete]

I thought the “so far” was implied by science - this is what we know about the universe (so far).

[pfdietz]

Not a valid excuse here.