Is the Zeta Draconis's thraddash-guarding battle... endless?

I'm trying to get some sort of sacred relic from a certain planet within the star system Zeta Draconis, which I found it guarded by a whole ton of thraddash ships.. and after some dialogue the thraddash "sent me into oblivion" (in other words, one shooting every ship they'd send).

So yeah, the problem isn't facing thraddash in battle, but the amount of them which were rounding the planet (from which I believe) they were almost 50 of them, and I've been one-shooting every single thraddash ship, but they keep coming and coming... I've been like 25 minutes doing the same thing over and over.

Does anyone know from a trivia or something, how many do I have to face? Or is it literally a ridiculous number intended to make me alt+f4 the game?

I'm playing The Ur-Quan Masters v0.7.0 if that means something.