Charles Sub-Lunar posits that the existence (and discovery) of the "internal planets of Protostar Five" is proof-positive of the existence of infinite alternate universes and probability mathematics.
"Probability math arises from the premise that we dwell in a truly infinite totality, space and time without limit, worlds without end—a creation so vast that what we are pleased to call our cause-and-effect datum Universe is a mere circle of candlelight. In such a totality we can only echo the words of Quixote: All things are possible... vindicated with the predicted discovery of the Internal Planets of Protostar Five."
Then humanity could be sure, even from this tiny grain of proof. On either side were ranged the alternate Universes, uncounted millions differing perhaps by the orbit of an electron. Further, the difference must be greater still, until in the looming shadows on the edge of imagination came the universes that had never known time, stars, space or rationality.
What's so special about these planets?