Carl Sagan or NdG Tyson would be my guesses at the genesis of the commentary.

I recall DD doing similarly eerie, almost echolalic-like things at 2-5yo, with these full phrases/pronouncements that I just knew had come from somewhere-- though she would expand on them or use them completely appropriately. It was kind of fun to try to ferret out where they'd come from. smile
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Schrödinger's cat walks into a bar. And doesn't.