Didn't very much care for this one. The whole story revolves around a question that the listener not only doesn't get an answer to, but the listener doesn't really even understand the situation at the end of the story.
So, there's an ark in space that's recovered at Europa. It has alien zygotes inside preserved over 100 million years, so presumably the species is now dead. There almost certainly weren't just two in cryopreservation, and even if there were, at the level of technology presented to the listener, more certainly could be cloned. So, why did humanity take just two and put them on a Death-Star mining ship and have them scour the universe for their home planet? Why were the aliens treated like this? Granted, being able to psychically detect which planets have life is morally useful when a species is strip-mining the galaxy for resources, but why specifically do this to them? It doesn't seem to make much sense to emotionally torture them like this. The characters themselves ask these questions, and a world of possibilities is opened up, and then one commits suicide and the story's over. That's incredibly dissatisfying to me.
Also, holy crap, what kind of resources was humanity in need of that planets were blown up on a routine basis for? How many planets were blown up in the course of this story? How is humanity using all of those incredible resources, and why? That's a mind-boggling question in itself. If humanity is trying to construct Ringworlds or Dyson Spheres, maybe mention that in the story, because those are the only structures I can think of that would take that amount of resources.